Table 1

Summary statistics for 1,031 female participants in wave 1 of ALSA classified according to age at menarche

Age at menarche


Characteristic

Overall

< 12

≥ 12

Missing

P-valuea

n = 1,031

n = 106

n = 883

n = 42


Age group

65 - 69

123

(12%)

14

(13%)

106

(12%)

3

(7%)

0.045

70 - 74

283

(27%)

41

(39%)

238

(27%)

4

(10%)

75 - 79

241

(23%)

26

(25%)

211

(24%)

4

(10%)

80 - 84

194

(19%)

14

(13%)

170

(19%)

10

(24%)

≥ 85

190

(18%)

11

(10%)

158

(18%)

21

(50%)

Place of residence

Community

948

(92%)

100

(94%)

821

(93%)

27

(64%)

0.601

Residential

83

(8%)

6

(6%)

62

(7%)

15

(36%)

Self rated health

Excellent/very good

401

(39%)

32

(30%)

357

(40%)

12

(29%)

0.114

Good

324

(31%)

36

(34%)

269

(31%)

19

(45%)

Fair/poor

306

(30%)

38

(36%)

257

(29%)

11

(26%)

Number of morbid conditions

Median (IQR)

3

(2 - 4)

3

(2 - 5)

3

(2 - 4)

2

(0 - 3)

0.012d

Cognitive function

Good

888

(86%)

99

(93%)

758

(86%)

31

(74%)

0.031

Poor

143

(14%)

7

(7%)

125

(14%)

11

(26%)

Smoking status

Never smoker

718

(69%)

66

(62%)

618

(70%)

35

(83%)

0.266

Former smoker

229

(23%)

29

(28%)

193

(22%)

7

(16%)

Current smoker

84

(8%)

11

(10%)

72

(8%)

1

(2%)

Sedentary

No

541

(52%)

54

(50%)

461

(52%)

26

(62%)

0.805

Yes

490

(48%)

52

(50%)

422

(48%)

16

(38%)

Body Mass Index

< 20 kg/m2

41

(4%)

2

(2%)

39

(4%)

0

(0%)

0.001

20 - 25 kg/m2

280

(27%)

18

(17%)

254

(29%)

8

(19%)

> 25 kg/m2

428

(42%)

64

(60%)

355

(40%)

9

(21%)

Missing

282

(27%)

22

(21%)

235

(27%)

25

(59%)

Natural menopause

No

273

(26%)

32

(30%)

219

(25%)

22

(52%)

0.229

Yes

758

(74%)

74

(70%)

664

(75%)

20

(48%)

Age at menopause

≤ 44b

104

(10%)

15

(14%)

89

(10%)

0

-

0.123

45 - 49

192

(19%)

19

(18%)

172

(19%)

1

(4%)

50 - 54

316

(31%)

33

(31%)

276

(31%)

7

(27%)

≥ 55

148

(15%)

7

(7%)

129

(15%)

12

(46%)

Surgical

254

(25%)

32

(30%)

216

(24%)

6

(23%)

Reproductive years

≤ 30c

218

(23%)

20

(19%)

198

(24%)

-

0.015

31 - 40

608

(65%)

63

(60%)

545

(65%)

-

≥ 40

116

(12%)

22

(21%)

94

(11%)

-

Parity

0

136

(13%)

14

(13%)

113

(13%)

9

(21%)

0.527

1 - 2

439

(43%)

44

(42%)

372

(42%)

23

(55%)

3 - 4

351

(34%)

41

(39%)

302

(34%)

8

(19%)

≥ 5

105

(10%)

7

(7%)

96

(11%)

2

(5%)

Age first pregnancy

Median (IQR)

25

(22 - 28)

24

(21 - 28)

25

(22 - 28)

26

(22 - 35)

0.149d

Age last pregnancy

Median (IQR)

33

(29-37)

33

(29 - 36)

33

(29 - 37)

31

(29 - 36)

0.425d

Dead at 15 years follow-up

No

358

(35%)

34

(32%)

319

(36%)

5

(12%)

0.411

Yes

673

(65%)

72

(68%)

564

(64%)

37

(88%)


Shown are n (%) unless otherwise noted.

a: P-value excludes missing category in calculation

b: n = 954 available age at menopause

c: n = 942 available reproductive years

d: P-value based on Mann-Whitney U-test; all other shown P-values based on chi-square tests of association

Giles et al. BMC Public Health 2010 10:341   doi:10.1186/1471-2458-10-341

Open Data