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

From: Lower age at menarche affects survival in older Australian women: results from the Australian Longitudinal Study of Ageing

   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/m 2 41
(4%)
2
(2%)
39
(4%)
0
(0%)
0.001
20 - 25 kg/m 2 280
(27%)
18
(17%)
254
(29%)
8
(19%)
 
> 25 kg/m 2 428
(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      
≤ 44 b 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      
≤ 30 c 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%)
 
  1. Shown are n (%) unless otherwise noted.
  2. a: P-value excludes missing category in calculation
  3. b: n = 954 available age at menopause
  4. c: n = 942 available reproductive years
  5. d: P-value based on Mann-Whitney U-test; all other shown P-values based on chi-square tests of association