Table 1.
Characteristics of the study population according to duration of breastfeeding above 50 years (n = 3454)
| Variables | Duration of breastfeeding (months) | |||||
|---|---|---|---|---|---|---|
| All women | None | 1–24 mths | 25–48 mths | ≥49 mths | P-valuea | |
| (n = 3454) | (n = 298) | (n = 1042) | (n = 815) | (n = 1299) | ||
| n (weighted %) | n (weighted %) | n (weighted %) | n (weighted %) | n (weighted %) | ||
| Age (years) (mean ± sd) | 3454 | 57.5 ± 7.6 | 56.5 ± 6.5 | 61.6 ± 7.5 | 70.7 ± 8.4 | <.001 |
| Household income | 3417 | |||||
| Low | 1184 | 67 (23) | 199 (19.3) | 241 (29.8) | 677 (52.8) | <.001 |
| Middle-low | 850 | 75 (25.7) | 262 (25.3) | 226 (28) | 287 (22.4) | |
| Middle- High | 674 | 58 (19.9) | 251 (24.3) | 190 (23.5) | 175 (13.6) | |
| High | 709 | 92 (31.5) | 322 (31.1) | 151 (18.7) | 144 (11.2) | |
| Smoking status | 3453 | |||||
| Never smoker | 2668 | 217 (72.8) | 757 (72.7) | 639 (78.4) | 1055 (81.3) | <.001 |
| Ex-smoker | 102 | 14 (4.7) | 24 (2.3) | 14 (1.7) | 50 (3.9) | |
| Current smoker | 131 | 21 (7.1) | 49 (4.7) | 20 (2.5) | 41 (3.2) | |
| Indirect smoking | 552 | 46 (15.4) | 212 (20.4) | 142 (17.4) | 152 (11.7) | |
| Drinking | 3438 | |||||
| Non alcohol consumption | 1789 | 149 (50.2) | 447 (43.2) | 399 (49.1) | 794 (61.4) | <.001 |
| < 1 drinking episode per month | 794 | 79 (26.6) | 252 (24.4) | 224 (27.6) | 239 (18.5) | |
| < 5 drinking episode per month | 663 | 52 (17.5) | 262 (25.3) | 154 (18.9) | 195 (15.1) | |
| ≥ 5 drinking episodes per month | 192 | 17 (5.7) | 73 (7.1) | 36 (4.4) | 66 (5.1) | |
| BMI(kg/m2) (mean ± sd) | 3450 | 23.6 ± 2.9 | 24 ± 3.1 | 24.6 ± 3.2 | 24.4 ± 3.4 | <.001 |
| Underweight (< 18.5) | 92 | 8 (2.7) | 16 (1.5) | 15 (1.9) | 53 (4.1) | <.001 |
| Normal (18.5 ~ 24.9) | 2052 | 197 (66.1) | 688 (66.2) | 443 (54.5) | 724 (55.7) | |
| Obese (≥25) | 1306 | 93 (31.2) | 336 (32.3) | 355 (43.7) | 522 (40.2) | |
| Children(n) (mean ± sd) | 3451 | 1.7 ± 1.2 | 2.2 ± 0.9 | 3 ± 0.9 | 4.7 ± 1.7 | <.001 |
| None | 79 | 75 (25.2) | 2 (0.2) | 1 (0.1) | 1 (0.1) | <.001 |
| 1–2 | 1262 | 167 (56) | 834 (80) | 199 (24.5) | 62 (4.8) | |
| 3–4 | 1395 | 49 (16.4) | 184 (17.7) | 585 (71.9) | 577 (44.5) | |
| ≥ 5 | 715 | 7 (2.4) | 22 (2.1) | 29 (3.6) | 657 (50.7) | |
| Abortion(n) | 3445 | |||||
| None | 975 | 109 (36.8) | 248 (23.9) | 202 (24.8) | 416 (32.1) | <.001 |
| 1–2 | 1664 | 132 (44.6) | 572 (55.1) | 383 (47.1) | 577 (44.5) | |
| ≥ 3 | 806 | 55 (18.6) | 218 (21) | 229 (28.1) | 304 (23.4) | |
| Hormone replacement therapy (months) | 3450 | |||||
| None | 2945 | 255 (85.9) | 843 (80.9) | 660 (81.1) | 1187 (91.5) | <.001 |
| < 6 | 149 | 10 (3.4) | 54 (5.2) | 48 (5.9) | 37 (2.9) | |
| < 12 | 29 | 3 (1) | 14 (1.3) | 6 (0.7) | 6 (0.5) | |
| ≥ 13 | 327 | 29 (9.8) | 131 (12.6) | 100 (12.3) | 67 (5.2) | |
| Menopause | 3452 | |||||
| No | 216 | 37 (12.4) | 133 (12.8) | 37 (4.6) | 9 (0.7) | <.001 |
| Yes | 3236 | 261 (87.6) | 909 (87.2) | 777 (95.5) | 1289 (99.3) | |
| Dyslipidemia | 3454 | |||||
| No | 2945 | 250 (83.9) | 888 (85.2) | 695 (85.3) | 1112 (85.6) | 0.592 |
| Yes | 509 | 48 (16.1) | 154 (14.8) | 120 (14.7) | 187 (14.4) | |
| Diabetes | 3152 | |||||
| No | 2047 | 199 (71.6) | 708 (72.2) | 498 (65) | 642 (57) | <.001 |
| Yes | 1105 | 79 (28.4) | 273 (27.8) | 268 (35) | 485 (43) | |
| Hypertension | 3446 | |||||
| No | 1645 | 169 (56.9) | 618 (59.5) | 377 (46.4) | 481 (37.1) | <.001 |
| Yes | 1801 | 128 (43.1) | 421 (40.5) | 436 (53.6) | 816 (62.9) | |
| Knee joint pain | 3454 | |||||
| No | 2365 | 241 (80.9) | 826 (79.3) | 574 (70.4) | 724 (55.7) | <.001 |
| Yes | 1089 | 57 (19.1) | 216 (20.7) | 241 (29.6) | 575 (44.3) | |
| Hip joint pain | 3454 | |||||
| No | 2942 | 264 (88.6) | 939 (90.1) | 711 (87.2) | 1028 (79.1) | <.001 |
| Yes | 512 | 34 (11.4) | 103 (9.9) | 104 (12.8) | 271 (20.9) | |
| Low back pain | 3454 | |||||
| No | 2247 | 236 (79.2) | 797 (76.5) | 541 (66.4) | 673 (51.8) | <.001 |
| Yes | 1207 | 62 (20.8) | 245 (23.5) | 274 (33.6) | 626 (48.2) | |
| Osteoarthritis | 3454 | |||||
| No | 2715 | 264 (88.6) | 934 (89.6) | 649 (79.6) | 868 (66.8) | <.001 |
| Yes | 739 | 34 (11.4) | 108 (10.4) | 166 (20.4) | 431 (33.2) | |
a. P-value from complex samples general linear model or Rao-Scott chi-squared test for continuous or categorical variables