Table 2. Demographics of postmenopausal women aged ≥50 years by the type of age-related macular degeneration (AMD) in the KNHANES 2010–2012.
| No AMD(n = 3845) | Early AMD | Late AMD | |||
| (n = 500) | P valuea | (n = 32) | P valuea | ||
| Age, y | 62.4±0.2 | 68.9±0.5 | <0.001 | 69.6±2.7 | 0.006 |
| Age at menarche, y | 16.1±0.0 | 16.4±0.1 | 0.005 | 16.9±0.4 | 0.084 |
| Age at menopause, y | 49.2±0.1 | 48.9±0.3 | 0.242 | 48.8±0.9 | 0.661 |
| Reproductive years, y | 33.1±0.1 | 32.5±0.3 | 0.044 | 32.0±0.8 | 0.141 |
| Postmenopausal period, y | 13.2±0.2 | 20.0±0.6 | <0.001 | 20.8±3.0 | 0.010 |
| Number of pregnancy | 4.7±0.0 | 5.5±0.1 | <0.001 | 4.4±0.4 | 0.369 |
| Number of spontaneous abortion | 0.3±0.0 | 0.3±0.0 | 0.657 | 0.2±0.1 | 0.220 |
| Number of artificial abortion | 1.3±0.0 | 1.3±0.1 | 0.708 | 1.0±0.4 | 0.485 |
| Number of parity | 3.1±0.0 | 3.8±0.1 | <0.001 | 3.1±0.2 | 0.948 |
| Duration of lactation, m | 48.4±1.1 | 69.7±3.1 | <0.001 | 44.5±6.7 | 0.565 |
| Duration of OCP use, m | 5.2±0.4 | 5.9±0.9 | 0.495 | 27.7±21.5 | 0.296 |
| Duration of HRT use, m | 5.0±0.4 | 4.5±0.9 | 0.570 | 4.1±2.6 | 0.724 |
OCP = oral contraceptive pills; HRT = hormone replacement therapy.
a
Comparison with no AMD group, not adjusted for any covariate.