MONICA Manual, Part III, Section 1

	Population survey CORE DATA TRANSFER FORMAT - SURVEY DATA Form: 04 Version: 3         9.6.86

Note for the HTML-version: These instructions were extracted word to word from Version 3 of Form 04, which was part of the November 1986 revision of the MONICA Manual. Therefore, references to other sections of the Manual also refer to the November 1986 revision, which has not been converted to HTML.

Instructions

The purpose of this form is to provide an exact and common format for the Core Data from the population surveys for transfer to the MONICA Data Centre (MDC). The data should be sent on magnetic tapes, not on paper forms. Instructions for data transfer on magnetic tapes are given in Section 10: Data Transfer on Magnetic Tapes to the Data Centre. To avoid errors, special attention should be paid in extracting the data required on this form from the local data set.

Compared to the screening record of the Protocol (WHO/MNC/82.1 Rev.1, May 1983, page 23), four items have been added here: Form version, MONICA Reporting Unit, Date of total cholesterol determination and Blood pressure measurer. (if data are not available for the date of total cholesterol determination or for the blood pressure measurer for the first survey please act according to the specific instructions for that item.)Furthermore, instead of the item "Age in years at last birthday before the day of screening", (which can be calculated from Date of examination and Date of birth) the age-goup when the person was originally selected to the survey sample is asked.

General instructions

The ITEM NAME on the form is a computer variable name used for the item by the MDC.

The COLUMNS indicate the columns on which the value of the item is to appear in the record on the magnetic tape. Data for different subjects must be written on different records. It is recommended that the MONICA Collaborating Centres (MCC's) use records long enough to include all data of a person included in the sample. If this is not possible, the data for a person should be split into two records according to the instructions given in Section 10: Characteristics of the Tape.

Blanck fields are not allowed in the magnetic tape record. Permissible characters are 0,1,2,3,4,5,6,7,8,9.

Instructions for making corrections to data that have already been sent to the MDC are given in Section 10.

Please contact the MDC for instructions if you cannot provide information as specified on this document.

Specific instructions for each item

These instructions should be followed carefully when creating a computer file to be transferres to the MDC. Please ensure that the instructions are for the version of the Core Data Transfer Format being used. Specific instructions are listed by item below:

Item 1

Enter number 04 to indicate the CORE DATA TRANSFER FORMAT-SURVEY DATA.

Item 2

Enter the version number printed on the form. If the number is not 3 these instructions do not correspond to the form you are using. Check that you are using the valid version of the form.

Item 3

Enter the official MONICA Collaborating Centre Code number as it appears in Appendix 1: Official MONICA Centre and Reporting Unit Names and Code numbers. If your centre is not listed or is erroneously listed in this appendix, contact the MDC for instructions.

Item 4

Enter the official MONICA Reporting Unit code number as it appears in Appendix 1. Even if your centre has only one reporting unit please enter the appropriate code number here. Do not leave blanks in this item.

Item 5

Enter here the serial number of the subject for whom the form is being filled. The serial number consists of six digits. Each serial number issued must be unique within each MONICA Reporting Unit and within each of the two or three surveys. Different MONICA Reporting Units and different surveys may use the same serial numbers. Check that the serial number you enter is correct.

Item 6

If three surveys are carried out in the MONICA Reporting Unit enter 1 for the first, 2 for the middle and 3 for the third survey. If only two surveys (i.e. the first and the final) are carried out, code 1 for the first and 3 for the second.

Item 7

If the person attended the survey examination (i.e. he or she was a responder), enter here the exact date when the physical/clinical examination of the person was carried out. If the person comes to the clinic more than once enter here the date which best identifies the day of the risk factor assessments (smoking, blood pressure, venous blood specimen taken for cholesterol).

The first two columns are reserved for the day of the examination; code 01 - 31 for specific dates. The third and fourth columns are reserved for the month of the examination; code 01 - 12. The last two columns are for the year, but only the last two digits are entered and the first two digits (19) are not entered.

If the person returns the completed questionnaire by mail but does not come to the clinical examinations and has left this item blank, enter here the date of receipt of the mailed questionnaire.

Please make sure that all dates do fit the study period in your centre.

Item 8

Enter the exact date of birth. The first two columns are for the day; code 01 -31 for specific dates, or code 99 if the day is not known. The next two columns are for the month; code 01 - 12, or code 99 if the month is not known. The last two columns are for the year, but only the last two digits are entered and the first two digits (19) are not entered. If the year of birth is not known, use an estimate of the age to derive a year of birth and code that. Records with the year of birth entered as 99 (not known) are not acceptable as they cannot be allocated to an age group for analysis.

Item 9

If the sampling was done stratified by age group, code here the ten-year age group in which the person was selected to the survey sample. Codes 1,2,3 and 4 are self-explanatory. Code 8 if stratification by age group was not used.

Code 9 applies only to the first survey already carried out and to the cases where this information is not available retrospectively.

Item 10

Enter 1 if the subject is male and 2 if female.

Item 11

Indicate marital status as follows:

1 = Single, for persons who have never been married.
2 = Married or cohabiting, for persons currently married or cohabiting.
3 and 4 are for currently single persons who were previously married.
If code 5 is used the MCC must prepare a manual list of the options specified.
Code 9 for insufficient data.

Item 12

Codes 1, 2 and 3 are self-explanatory. Use these codes in the order of priority given so that the smallest code takes precedence.
Code 4 if primary school only or if less than primary school.
Code 9 for insufficient data.

Item 13

Code the number of years. For the years 1 - 9 use codes 01 - 09.
Code 99 for insufficient data.

Item 14

Code 1 if regular smoker, i.e. the person smokes cigarettes every day.
Code 2 if non-smoker, i.e. the person does not smoke cigarettes at all.
Code 3 is used when the person smokes cigarettes but not regularly.
Code 9 for insufficient data.

Item 15

Record the number of cigarettes smoked daily. If CIGS = 3 and the average number of cigarettes is less than one per day this item should be coded 000.

For the amounts 1 - 9, code 001 - 009 and for amounts 10 - 99, code 010 - 099.
Code 888 if CIGS = 2.
Code 999 if data are insufficient to record the daily number of cigarettes.

Item 16

Codes 1 and 3 are used for persons who have stopped smoking. In such cases CIGS  = 2 or 9 and NUMCIGS = 888 or 999.
Code 2 is used for never-smokers. In such cases CIGS = 2 and NUMCIGS = 888
Code 8 if CIGS = 1 or 3

Item 17

Record the year with four digits or record 9999 in cases when EVERCIG = 1 or 3.
Code 8888 if  smoking now or never smoked, i.e. EVERCIG = 2 or 8.

Item 18

Codes 1, 2 and 3 are self-explanatory.
Code 8 is used if the person is a smoker, i.e. CIGS = 1 or if the person smokes only occasionally, i.e. CIGS = 3 or if the person has never smoked, i.e. EVERCIG = 2, or if the person has stopped smoking more than 12 months ago.
Code 9 for insufficient data.

Item 19

Record the number of cigars or cigarillos smoked.
Code 000 if a non-smoker or occasional smoker (less than one per week on average).
Code 999 for insufficient data. 

Item 20

Record the number of grams (1 ounce = 30 grams).
If a non-smoker or occasionally smoker (less than one gram per week on average), code 000.
Code 999 for insufficient data. 

Item 21

Code 1 if yes and code 2 if no.
Code 9 if the person did not provide sufficient information to use codes 1 or 2.

Item 22

Code 1 if using blood pressure lowering drugs during the last two weeks.
Code 2 if no such drugs used.
Code 3 if the use of blood pressure lowering drugs is reported but the person in question is not sure wherher these have been used during the last two weeks or he/she is not sure whether the drugs used were for hypertension.
Code 8 if HIPB = 2.
Code 9 if the person did not provide sufficient information to use codes 1,2 or 3.

Item 23

Record the first systolic blood pressure value measured to the nearest 2 mmHg. If odd values for the last digit have been used by the observers, these should not be changed but such values should be double checked as they are considered to be unusual values.

If blood pressure was measured with a Random Zero device the value here should be the actual reading as observed at the examination. Do not record here blood pressure value after deducting the zero level of the Random Zero device; the zero level is given separately in the item RZ1.

Code 888 if the person attended the clinic but blood pressure was not measured or if only SYST2 was recorded.
Code 999 if the person did not attend the survey examination.

If the first survey has already been carried out it might not be possible to identify whether a person attended the clinic but blood pressure was not measured or whether the person did not attend the survey examination at all. In such cases this item should be coded 999.

Item 24

Record the first phase 5 diastolic blood pressure value measured to the nearest 2 mmHg. If odd values for the last digit have been used by the observers, these should not be changed but such values should be double checked as they are considered to be unusual values.

If blood pressure was measured with a Random Zero device the value here should be the actual reading as observed at the examination. Do not record here the blood pressure value after deducting the zero level of the Random Zero device; the zero level is given separately in the item RZ1.

Code 888 if the person attended the clinic but blood pressure was not measured or if only DIAST2 was recorded.
Code 999 if the person did not attend the survey examination.

If the first survey has already been carried out it might not be possible to identify whether a person attended the clinic but blood pressure was not measured, or whether the person did not attend the survey examination at all. In such cases this item should be coded 999.

Item 25

Record here the zero level of the random zero device after the first blood pressure measurement to the nearest 2 mmHg. If odd values for the last digit have been used by the observers, these should not be changed but such values should be double checked as they are considered to be unusual values.

Code 88 if the random zero device was not used in the blood pressure measurement.
Code 99 if the person did not attend the survey examination.

If the first survey has already been carried out it might not be possible to identify whether a person attended the clinic but blood pressure was not measured or whether the person did not attend the survey examination at all. In such cases this item should be coded 99.

Item 26

Record the second systolic blood pressure measured to the nearest 2 mmHg. If odd values for the last digit have been used by the observers, these should not be changed but such values should be double checked as they are considered to be unusual values.

If blood pressure was measured with a Random Zero device the value here should be the actual reading as observed at the examination. Do not record here blood pressure value after deducting the zero level of the Random Zero device; the zero level is given separately in the item RZ2.

Code 888 if the person attended the clinic but blood pressure was not measured or if only SYST1 was recorded.
Code 999 if the person did not attend the survey examination.

If the first survey has already been carried out it might not be possible to identify whether a person attended the clinic but blood pressure was not measured or whether the person did not attend the survey examination at all. In such cases this items should be coded 999.

Item 27

Record the second phase 5 diastolic blood pressure measured to the nearest 2 mmHg. If odd values for the last digit have been used by the observers, these should not be changed but such values should be double checked as they are considered to be unusual values.

If blood pressure was measured with a Random Zero device the value here should be the actual reading as observed at the examination. Do not record here blood pressure value after deducting the zero level of the Random Zero device; the zero level is given separately under item RZ2.

Code 888 if the person attended the clinic but blood pressure was not measured or if only DIAST1 was recorded.
Code 999 if the person did not attend the survey examination.

If the first survey has already been carried out it might not be possible to identify whether a person attended the clinic but blood pressure was not measured or whether the person did not attend the survey examination at all. In such cases this item should be coded 999.

Item 28

Record the zero level of the random zero device after the second blood pressure measurement to the nearest 2 mmHg. If odd values for the last digit have been used by the observers, these should not be changed but such values should be double checked as they are considered to be unusual values.

Code 88 if the random zero device was not used in the blood pressure measurement.
Code 99 if the person did not attend the survey examination.

If the first survey has already been carried out it might not be possible to identify whether a person attended the clinic but blood pressure was not measured or whether the person did not attend the survey examination at all. In such cases this item should be coded 99.

Item 29

Record here total serum cholesterol with one decimal precision in units mmol/l. There is no place for the decimal point and, therefore, the unit is mmol/10 l instead of the usual mmol/l. For example, if the cholesterol value is 5.8 mmol/l, code here 058.

Code 888 if the person attended the clinic but a blood specimen was not taken, or if laboratory values are given in mg/dl.
Code 999 if the person did not attend the survey examination.

If the first survey has already been carried out it might not be possible to identify whether a person attended the clinic but blood cholesterol was not measured or whether the person did not attend the survey examination at all. In such cases this item should be coded 999.

Item 30

If serum total cholesterol values in the laboratory are given in units mg/dl record these values here. For example, if the cholesterol value is 208 mg/dl, code 208.

Code 888 if laboratory values are given in units mmol/l.

Item 31

Record here serum HDL cholesterol to two decimal places in units mmol/l. There is no place for the decimal point and, therefore, the unit is mmol/100 l instead of the usual mmol/l. For example, if the HDL cholesterol value is 0.93 mmol/l, code 093.

Code 777 if HDL cholesterol determination was not done although a blood specimen was taken.
Code 888 if the person attended the clinic but a blood specimen was not taken, or if laboratory values are given in mg/dl.
Code 999 if the person did not attend the survey examination.

If the first survey has already been carried out it might not be possible to identify whether a person attended the clinic but blood cholesterol was not measured or whether the person did not attend the survey examination at all. In such cases this item should be coded 999.

Item 32

If serum HDL cholesterol values in the laboratory are given in units mg/dl record these values here. For example, if the cholesterol value is 42 mg/dl, code here 042.

Code 777 if HDL cholesterol determination was not done although a blood specimen was taken.
Code 888 if laboratory values are given in mmol/l.
Code 999 if the person did not attend the survey examination.

Item 33

Record here the serum thiocyanate value.
Code 777 if thiocyanate determination was not done although blood specimen was taken.
Code 888 if blood specimen not taken or was missed in the laboratory.
Code 999 if person did not attend the survey examination.

Item 34

Record height in centimetres.
Code 999 for insufficient data.

Item 35

Record body weight to the nearest 200 g. There is no place for the decimal point. If data are given to the nearest 100 g or any other unit, please inform the MDC of this.

Code 999 for insufficient data.

Item 36

Enter here the exact date of the serum cholesterol determination in the laboratory. The first two columns are for the day of the determination. Use an initial "0" for numbers 1-9 (i.e. 01-09). Code 99 if the exact day is unknown. The next two columns are for the month of the determination. Code 99 if the month remains unknown. The last two columns of this item are for the year of determination. Code 99 if the year remains unknown; this should occur very rarely.

Item 37

Each blood pressure measurer in an MCC should be given a unique two-digit code number between 01 and 98, excluding number 88.

Enter here the identification code number of the person who measured the blood pressure. If blood pressure was not measured code 88. If the blood pressure measurer is not known although blood pressure was measured code 99.