| | |
Age at menarche (years)
|
Total+
|
|---|
| | |
Online (%)
|
Paper (%)
| | | |
|---|
| | |
n
|
≤ 12
|
≥ 13
|
P
|
n
|
≤ 12
|
≥ 13
|
P
|
AOR
|
95%CI
|
P
|
|---|
|
Age at
|
16-24 years
|
345
|
44.3
|
39.7
|
0.179
|
495
|
84.6
|
86.3
|
0.559
|
ns
| | |
|
survey
|
≥ 25 years
|
477
|
55.7
|
60.3
| |
83
|
15.4
|
13.7
| | | | |
|
Ethnicity
|
white
|
792
|
95.8
|
97.3
|
0.243
|
547
|
93.8
|
95.4
|
0.387
|
ns
| | |
| |
other
|
28
|
4.2
|
2.7
| |
30
|
6.2
|
4.6
| | | | |
|
Sexuality
|
heterosexual
|
749
|
91.5
|
91.9
|
0.825
|
527
|
95.8
|
95.3
|
0.786
|
ns
| | |
| |
lesbian/bisexual
|
68
|
8.5
|
8.1
| |
25
|
4.2
|
4.7
| | | | |
|
Number of
|
≤ 1
|
506
|
59.6
|
63.5
|
0.251
|
443
|
72.7
|
79.2
|
0.071
|
Ref
| | |
|
childhood illnesses§
|
≥ 2
|
316
|
40.4
|
36.5
| |
135
|
27.3
|
20.8
| |
1.87
|
(0.98-3.57)
|
*
|
|
Overweight§
|
no
|
704
|
83.2
|
88.3
|
*
|
493
|
78.8
|
89.7
|
***
|
Ref
| | |
| |
yes
|
117
|
16.8
|
11.7
| |
84
|
21.2
|
10.3
| |
1.89
|
(1.36-2.63)
|
***
|
|
Father at
|
no
|
160
|
18.7
|
21.4
|
0.340
|
119
|
22.1
|
21.4
|
0.838
|
ns
| | |
|
home§
|
yes
|
640
|
81.3
|
78.6
| |
430
|
77.9
|
78.6
| | | | |
|
Days off
|
≤ 10
|
672
|
78.0
|
86.7
|
0.712
|
479
|
73.5
|
84.3
|
0.144
|
ns
| | |
|
school per year§
|
≥ 11
|
142
|
22.0
|
13.3
| |
91
|
26.5
|
15.7
| | | | |
|
In poorest socio-
|
no
|
501
|
61.2
|
66.8
|
0.105
|
415
|
75.2
|
79.8
|
0.213
|
Ref
| | |
|
economic grouping$§
|
yes
|
282
|
38.8
|
33.2
| |
117
|
24.8
|
20.2
| |
1.32
|
(1.03-1.71)
|
*
|
-
$ Socio-economic grouping is based on highest ranking parents. Lowest grouping includes those whose parents' occupation was semi-routine and routine and those who never worked or were long-term unemployed (see methods for more details). §Questions refer to childhood before menarche (see methods for more details). *<0.05, **<0.01, ***<0.001, ns = not significant. +Logistic regression analysis utilised all variables in table as well as data source (i.e. online or paper), AOR = Adjusted Odds Ratio, CI = Confidence Intervals.
