Table 1.
Association analysis between DM type 2 risk and sociodemographic variables in unmatched and matched case–control studies
| Variables | Unmatched case–control study
|
Matched case–control study
|
||
|---|---|---|---|---|
| OR | p-value | OR | p-value | |
| Selected variables, final model | ||||
| Age as of year 2008a | 1.030 | 0.007 | – | – |
| BMI in year 2008 | 1.200 | <0.001 | 1.277 | <0.001 |
| Exercise | 2.285 | 0.221 | 2.571 | 0.158 |
| History of illness in parentsa | 2.119 | 0.046 | – | – |
| History of illness in siblings | 2.913 | 0.010 | 5.846 | 0.005 |
| Smoke (ever smoked?)b | – | – | 4.440 | 0.181 |
| Drinking (ever drank?) | 3.363 | 0.028 | 5.000 | 0.197 |
| Govt (Ref laborer and others)b | – | – | 0.376 | 0.131 |
| Motorcar ownership (including motorcycle) | 0.312 | 0.131 | 0.207 | 0.018 |
Notes:
a
Only unmatched.
b
Only matched. – means result is not available because the variable was not included in the analysis model.
Abbreviations: DM, diabetes mellitus; OR, odds ratio; BMI, body mass index; Govt, government officers/business owners; Ref, reference.