Table 2.
Comparison of those included and excluded from the study samplea.
| In study sample (N = 3675) |
Not in study sample (N = 2633) |
P value | |
|---|---|---|---|
| Mean (SD) or % | Mean (SD) or % | ||
| Sex (% men) | 68.4 | 74.0 | < 0.001 |
| Age (yr) | 69.8 (5.8) | 69.9 (6.0) | 0.301 |
| Ethnicity (% white) | 94.2 | 90.5 | <0.001 |
| Employment grade (% lowest) | 9.1 | 10.7 | 0.045 |
| HCCb | 3.5 (3.7) | 6.3 (12.7) | <0.001 |
| Original hair colour (%grey/white) | 78.3 | 79.8 | 0.100 |
| Hair dyed (% dyed) | 16.5 | 20.8 | 0.004 |
| Hair treated (% treated) | 4.1 | 4.7 | 0.408 |
| Hair washing freq. (once a week) | 30.5 | 31.5 | 0.367 |
| Season collected (% spring) | 8.7 | 8.5 | <0.001 |
| Storage (% ≤18 months) | 15.5 | 17.8 | 0.002 |
| Steroid medication (% No) | 90.9 | 91.4 | 0.544 |
| CVD drugs | 40.8 | 37.7 | 0.011 |
| BMI% obese | 19.8 | 19.0 | 0.179 |
| Diabetes | 85.7 | 83.8 | 0.035 |
| CHD | 72.5 | 74.0 | 0.187 |
| Stroke | 96.7 | 96.1 | 0.266 |
| CES-D | 88.1 | 85.9 | 0.011 |
a
Among those eligible participants at phase 11 (N = 6308).
b
Geo-means of HCC.