Table 1 Basic characteristics of the study population by age at menarche

Variables

Total (n = 60,135)

≤12

13

14

15

≥16

(n = 9347)

(n = 13,476)

(n = 23,184)

(n = 9017)

(n = 5108)

Age at enrolment, mean (SD)

29 (4)

30 (4)

30 (40)

29 (4)

29 (4)

30 (4)

BMI (kg/m²), mean (SD)

23 (4)

23 (4)

23 (4)

22 (4)

22 (4)

22 (4)

Overweight (BMI 24–28), n (%)

11,613 (19)

2060 (18)

2652 (23)

4319 (37)

1621 (14)

961 (8)

Obese (BMI ≥ 28), n (%)

4244 (7)

894 (21)

973 (23)

1474 (35)

580 (14)

323 (8)

SBP (mmHg), n (%)

112 (10)

112 (11)

112 (10)

112 (10)

112 (10)

112 (10)

DBP (mmHg), n (%)

72 (8)

72 (9)

72 (8)

72 (8)

72 (8)

72 (8)

Alcohol drinker, n (%)

4237 (7)

1388 (33)

1022 (24)

988 (23)

450 (11)

389 (9)

Active smoker, n (%)

774 (1)

241 (31)

182 (24)

167 (22)

101 (13)

83 (11)

Passive smoking, n (%)

14,892 (25)

4103 (28)

3622 (24)

3683 (25)

1926 (13)

1558 (10)

Imbalanced diet, n (%)

1350 (2)

274 (20)

327 (24)

359 (27)

181 (13)

209 (15)

Education (years)

  ≤ 9, n (%)

22,537 (37)

1466 (7)

4698 (21)

10,159 (45)

4122 (18)

2092 (9)

 10~ 15, n (%)

11,372 (19)

1507 (13)

2518 (22)

4540 (40)

1696 (15)

1111 (10)

  ≥ 16, n (%)

26,181 (44)

6362 (24)

6250 (24)

8473 (32)

3194 (12)

1902 (7)

Occupation

 Manual work, n (%)

43,286 (73)

4454 (10)

9250 (21)

18,632 (43)

7149 (17)

3801 (9)

 Non-manual work, n (%)

15,178 (26)

4294 (28)

3841 (25)

4170 (27)

1709 (11)

1164 (8)

 Unemployed, n (%)

883 (2)

298 (34)

200 (23)

213 (24)

94 (11)

78 (9)

Region

 Rural, n (%)

39,233 (65)

3242 (8)

8409 (21)

17,356 (44)

6662 (17)

3564 (9)

 Urban, n (%)

20,911 (35)

6105 (29)

5076 (24)

5830 (28)

2356 (11)

1544 (7)

Psychological stress, n (%)

14,306 (24)

4306 (30)

3560 (25)

3505 (25)

1726 (12)

1209 (8)

Parity

 None, n (%)

28,325 (47)

5920 (21)

6600 (23)

10,210 (36)

3664 (13)

1931 (7)

  ≥ 1, n (%)

31,810 (53)

3427 (11)

6876 (22)

12,976 (41)

5354 (17)

3177 (10)

Oral contraceptive use, n (%)

417 (1)

115 (28)

113 (27)

102 (24)

44 (11)

43 (10)

Family history of hypertension, n (%)

95 (0)

28 (29)

23 (24)

28 (29)

10 (11)

6 (6)

Diabetes, n (%)

809 (1)

157 (19)

187 (23)

274 (34)

115 (14)

76 (9)

Hypertension, n (%)

1798 (3)

412 (23)

414 (23)

541 (30)

241 (13)

190 (11)