|
N=3249 |
N=85149 |
|
Maternal age, mean years (SD) |
32.9 (4·5) |
31·3 (4·9) |
<0·001a
|
Maternal age category, % |
|
|
|
≦19 |
0·1 |
0·6 |
<0·001b
|
20–24 |
3·2 |
8·5 |
|
25–29 |
20·3 |
28 |
|
30–34 |
37·7 |
35·9 |
|
35–39 |
31·7 |
22·5 |
|
≥ 40 |
7·1 |
4·5 |
|
DII before pregnancy, mean (SD) |
-0·38 (2·51) |
-0·02 (2·62) |
<0·001a
|
DII category, % |
|
|
|
Q1 (most proinflammatory group) |
14·3 |
19·8 |
0·001b
|
Q2 |
19·1 |
20·2 |
|
Q3 |
21·6 |
20·1 |
|
Q4 |
22 |
20·1 |
|
Q5 (most anti-inflammatory group) |
23 |
20·1 |
|
Maternal smoking, % |
4·9 |
4·6 |
0·528b
|
Maternal education, % |
|
|
|
<10 years |
3·6 |
4·5 |
<0·001b
|
10–12 years |
27 |
30·8 |
|
13–16 years |
45·5 |
42·2 |
|
≥17 years |
23·9 |
22·4 |
|
Household income |
|
|
|
< 2,000,000 JPY |
4·4 |
5·7 |
<0·001b
|
2,000,000–5,999,999 JPY |
64·1 |
67·8 |
|
6,000,000–9,999,999 JPY |
26·3 |
22·3 |
|
≥10,000,000 JPY |
5·2 |
4·2 |
|
BMI, % |
|
|
|
<18.5 |
15·6 |
16 |
0·031b
|
18.5–24.9 |
75·1 |
73·3 |
|
≥25 |
9·3 |
10·7 |
|
Uterine myoma, % |
16·1 |
5·8 |
<0·001b
|
Adenomyosis, % |
3·8 |
0·2 |
<0·001b
|
ART pregnancy, % |
10·7 |
2·7 |
<
0·001b
|