Description and quality of the baseline data:
Introduction
Kari Kuulasmaa1, Sangita Kulathinal1,2 and Matti Niemelä1 for the MORGAM Project3
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Description and quality of the baseline data:
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1 Department of Health Promotion and Chronic Disease Prevention, National Public Health Institute, Helsinki,
Finland
2 Since January 2007 at Indic Society for Education and Development
(INSEED), Nashik, India
3 See Annex for the sites and key
personnel of contributing MORGAM Centres
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© National Institute for Health and Welfare
and the MORGAM Project investigators Last updated: 4 July 2007 For more information, please contact Kari Kuulasmaa (firstname.lastname@thl.fi) |
In this section, we give an assessment of the quality of the data on specific MORGAM baseline data items and recommendations upon the use of different items in data analyses. General aspects of the baseline measurements, such as the target populations, selection and recruitment of the cohort members, and the periods of the baseline examinations are assessed in the separate section Description and quality of the cohorts. There is a separate section also for the Genetic data, although they are actually baseline data.
The characteristics and quality of the data are summarized and quantified using simple quality scores. Below are definitions for quality scores which are used in several subsections. Additional quality scores for specific topics are defined in the respective subsections.
| IDS = | 2 | if proportion of "insufficient data" < 5%, |
| 1 | if 5 <= proportion of "insufficient data" <= 15%, | |
| 0 | if proportion of "insufficient data" > 15%, | |
| dnp | if data not provided by the MPC and hence "insufficient data" for the entire cohort. |
The raw data are used in calculating IDS.
| QCS = | 2 | if there is an exact question in the local questionnaire, or if the MORGAM data can be extracted from the local questionnaire to match the MORGAM data transfer format exactly, |
| 1 | if an alternative formulation of the question was used in the local questionnaire compared to the MORGAM questionnaire, and the data can not be extracted fully, | |
| 0 | if no questionnaire is available at the MPC, no questions on data item under consideration in the local questionnaire, or the formulation of the question in the local questionnaire is significantly different from the MORGAM questionnaire, | |
| dnp | if IDS is dnp. |
QCS is used to assess the comparability of the local baseline questionnaires and the MORGAM data items. It does not consider possible errors in the algorithm used for extracting the MORGAM data from the local data. Therefore, for more complex situations, such as the smoking data, a separate quality scores for the algorithm used for the extraction will be defined. The original questionnaires used by the RUAs and their English translations are available in the MDC and are used in assigning the QCS.
| QSS = | 2 | if the sum of QCS and IDS is 3 or 4, |
| 1 | if both QCS and IDS are 1, | |
| 0 | if the QCS or IDS is 0, | |
| dnp | if IDS is dnp. |
| Date | Update |
|---|---|
| 2007-07-04 | First published version. |