Table 2.
Baseline characteristics of study participants according to GHQ-12 score
| GHQ-12 category (score) | Total no | ||||
|---|---|---|---|---|---|
| Asymptomatic (0) | Subclinically symptomatic (1-3) | Symptomatic (4-6) | Highly symptomatic (7-12) | ||
| No of participants | 41 528 | 16 760 | 5201 | 4733 | 68 222 |
| Female | 21 736 (52.3) | 9680 (57.8) | 3209 (61.7) | 3024 (63.9) | 68 222 |
| Age (mean (SD)) | 55.2 (13.7) | 55.3 (14.7) | 54.6 (14.9) | 53.3 (14.1) | 68 222 |
| Non-manual occupational social class* | 23 595 (57.8) | 9436 (57.6) | 2806 (55.7) | 2476 (53.7) | 66 834 |
| Body mass index (mean (SD)) | 27.1 (4.5) | 27.1 (4.8) | 27.2 (5.0) | 27.1 (5.4) | 62 640 |
| Systolic blood pressure† (mm Hg, mean (SD)) | 137.8 (20.4) | 136.9 (20.6) | 135.3 (20.7) | 134.2 (19.7) | 52 224 |
| Physical activity‡ | 28 215 (67.9) | 10 957 (65.4) | 3344 (64.3) | 2868 (60.6) | 68 222 |
| Current smoker | 8657 (20.9) | 3890 (23.2) | 1350 (26.0) | 1489 (31.5) | 68 191 |
| Drinks more than recommended alcohol limit§ | 7172 (21.5) | 2883 (20.5) | 847 (19.3) | 759 (19.1) | 55 796 |
| Diabetes (including hyperglycaemia) | 1172 (2.8) | 574 (3.4) | 203 (3.9) | 185 (3.9) | 68 222 |
Data are no (%) of participants unless stated otherwise. Any discrepancies in percentages are due to missing data. SD=standard deviation.
*Non-manual occupational social class comprises professional, managerial or technical, and skilled non-manual classes (I-IIINM) according to the Registrar General classification.
†Mean of second and third readings.
‡Binary variable: any weekly moderate to vigorous physical activity.
§Calculated using sex specific safe limits: ≤14 units per week for women and ≤21 units per week for men.