Table 3.
Comparison of the cohort characteristics between three parity groups
| Characteristics | Number of parities | Statistics* | ||||
|---|---|---|---|---|---|---|
| 0 | 1 to 4 | ≥ 5 | F or χ2 | P | Post hoc* | |
| Age, mean ± SD, years | 74 ± 8.3 | 72.3 ± 7.7 | 75.6 ± 7.7 | 224.345 | < 0.001 | a > b, a < c, b < c |
| Educational level, % | 1122.978 | < 0.001 | – | |||
| ≤ 6 years or primary school or under | 36.5 | 43.9 | 80.0 | |||
| 7 to 12 years or secondary school | 44.4 | 42.6 | 17.1 | |||
| > 12 years or tertiary school or above | 19.1 | 13.6 | 2.9 | |||
| Hypertension, % | 69.3 | 65.2 | 70.9 | 33.289 | < 0.001 | a > b, b < c |
| Diabetes mellitus, % | 13.1 | 16.5 | 23.5 | 84.376 | < 0.001 | a < b, a < c, b < c, |
| Dementia prevalence, % | 5.8 | 5.0 | 10.5 | 103.961 | < 0.001 | a < c, b < c, |
| Dementia subtypes,† % | 112.556 | < 0.001 | – | |||
| AD | 4.6 | 3.1 | 7.1 | |||
| VD | 0.6 | 0.5 | 1.1 | |||
| NAVD | 2.2 | 1.0 | 2.4 | |||
*Continuous variables were compared using analysis of variance, and categorical variables were compared using the χ2 test. Post hoc comparisons were based on Scheffé’s theorem: a = nulliparity; b = 1 to 4 parities; c = grand multiparity
†Estimated using 9 cohorts providing data on dementia subtypes