Table 2.
A comparison of covariate characteristics between latent classes
| Variables | Low (n = 632) | Medium (n = 368) | High (n = 28) | p value |
|---|---|---|---|---|
| Age at baseline, mean (SD) | 69.38 (0.83) | 69.92 (0.75) | 69.62 (0.74) | <0.0011* |
| Sex, n (%) | ||||
| Male | 324 (51.3) | 182 (49.5) | 14 (50.0) | 0.8572 |
| Female | 308 (48.7) | 186 (50.5) | 14 (50.0) | |
| Social class, n (%) | ||||
| Professional | 145 (23.0) | 37 (10.1) | 1 (3.6) | <0.0012* |
| Managerial | 261 (41.3) | 120 (32.6) | 7 (25.0) | |
| Skilled nonmanual | 140 (22.2) | 92 (25.0) | 3 (10.7) | |
| Skilled manual | 68 (10.8) | 98 (26.6) | 13 (46.4) | |
| Semiskilled/unskilled | 18 (2.9%) | 21 (5.7%) | 4 (14.3%) | |
| Age 11 cognitive ability, mean (SD) | 3.95 (9.08) | −5.57 (11.80) | −15.96 (15.30) | <0.0011* |
| Years of education, mean (SD) | 10.99 (1.16) | 10.29 (0.90) | 10.14 (0.89) | <0.0011* |
*
p < 0.001.
1
Linear model ANOVA.
2
Pearson's χ2 test. SD, standard deviation.