Table 1 Characteristics of the study population according to duration of breastfeeding above 50 years (n = 3454)

Age (years) (mean ± sd)

3454

57.5 ± 7.6

56.5 ± 6.5

61.6 ± 7.5

70.7 ± 8.4

Household income

3417

 Low

1184

67 (23)

199 (19.3)

241 (29.8)

677 (52.8)

 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)

 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)

 < 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

 Underweight (< 18.5)

92

8 (2.7)

16 (1.5)

15 (1.9)

53 (4.1)

 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

 None

79

75 (25.2)

2 (0.2)

1 (0.1)

1 (0.1)

 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)

 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)

 < 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)

 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)

 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)

 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)

 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)

 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)

 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)

 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)

 Yes

739

34 (11.4)

108 (10.4)

166 (20.4)

431 (33.2)