Table 2.
Baseline characteristics of participants and non-participants, Tehran Lipid and Glucose Study (1999-2018)*
| Participants, n = 8435 | Non-participants, n = 2980 | P-value | |
|---|---|---|---|
| Age (years) |
40.5 (13.8) |
40.1 (15.9) |
0.142 |
| BMI (kg/m2) |
26.5 (4.6) |
26.3 (5.1) |
0.092 |
| SBP (mmHg) |
116.8 (17.3) |
117.4 (18.8) |
0.186 |
| DBP (mmHg) |
76.5 (10.6) |
76.5 (10.8) |
0.944 |
| FPG (mmol/L)† |
4.9 (0.52) |
4.9 (0.6) |
0.023 |
| 2 h-PLPG (mmol/L) |
5.9 (1.6) |
5.9 (1.6) |
0.593 |
| TC (mmol/L) |
5.2 (1.2) |
5.2 (2.5) |
0.240 |
| TG (mmol/L)‡ |
1.5 (1.2) |
1.5 (1.1) |
0.164 |
| HDL-C (mmol/L)§ |
1.1 (0.2) |
1.1 (0.2) |
0.036 |
| FHD (yes) |
2166 (25.7) |
687 (23.1) |
0.004 |
|
Smoking:
| |||
| Never |
6515 (77.2) |
1995 (73.4)‖ |
|
| Past |
588 (7.0) |
178 (6.5) |
<0.001 |
| Current |
1332 (15.8) |
546 (20.1) |
|
| Hypertension (yes) |
1466 (17.4) |
514 (19.1) |
0.042 |
| Use of lipid lowering drugs (yes) |
184 (2.2) |
69 (2.3) |
0.668 |
| Use of blood pressure lowering drugs (yes) | 457 (5.4) |
183 (6.1) |
0.150 |
BMI – body mass index, SBP – systolic blood pressure, DBP – diastolic blood pressure, FPG – fasting plasma glucose, 2h-PLPG – 2 postload plasma glucose, TC – total cholesterol, TG – triglyceride, HDL-C – high-density lipoprotein cholesterol, FHD – family history of diabetes
*Values are presented as mean (SD) for continuous variables, and frequency (%) for categorical variables. Values for TG are presented as median (IQ).
†The exact values are 4.96 (0.52) and 4.99 (0.56) for participant and non-participants, respectively.
‡The TG was tested using the Mann-Whitney U test, because of its skewed distribution.
§The exact values are 1.08 (0.28) and 1.09 (0.29) for participant and non-participants, respectively.
‖Non-respondents had 261 missing values on smoking status.