Comparison of baseline characteristics between participants attending the first health examination only (1HE) and participants attending both the European Prospective Investigation of Cancer -Norfolk Eye Study (ENES) and 1HE
| Attended 1HE only | Attended ENES & 1HE | ||
|---|---|---|---|
| (n= 17529) | (n=8110) | p Value | |
| Age at 1HE (n=25639) | 60.8 (9.5) | 55.8 (7.9) | <0.001 |
| Sex (n=25639) | 0.13 | ||
| Male | 7992 (46%) | 3615 (45%) | |
| Female | 9537 (54%) | 4495 (55%) | |
| BMI at 1HE (n=25585) | 26.6 (4.0) | 25.8 (3.7) | <0.001 |
| Social class (n=25069) | <0.001 | ||
| Professional | 1041 (6%) | 713 (9%) | |
| Managerial/technical | 5835 (34%) | 3323 (41%) | |
| Skilled non-manual | 2841 (17%) | 1298 (16%) | |
| Skilled manual | 4135 (24%) | 1637 (20%) | |
| Partly skilled | 2478 (15%) | 883 (11%) | |
| Unskilled | 702 (4%) | 183 (2%) | |
| Education level (n=25621) | <0.001 | ||
| Degree | 1858 (11%) | 1431 (18%) | |
| A level | 6666 (38%) | 3590 (44%) | |
| O Level | 1657 (9%) | 965 (12%) | |
| Less than O level | 7332 (42%) | 2122 (26%) | |
| Smoking status (n=25419) | <0.001 | ||
| Current | 2279 (13%) | 705 (9%) | |
| Former | 7615 (44%) | 3146 (39%) | |
| Never | 7447 (43%) | 4227 (52%) |
Note that the 513 participants who only attended the ENES are not in this table. There were missing data for body mass index (BMI), social class, education level and smoking status, reflected in the total numbers presented. Mean (SD) is presented for continuous variables and number (percentage) for categorical variables.