| Gestational
age (weeks) |
Singletons Twins |
Odds ratio[95%CI] |
Odds ratio[95%CI] Twins vs. singletons |
Odds ratio[95%CI] Singletons |
Twins |
| Number |
IMR1 |
Number |
IMR1 |
| Q00-Q07 |
|
|
|
|
|
|
|
| <31 |
41 |
8.5 |
15 |
12.6 |
1.48 [0.82-2.68] |
58.95 [41.12-84.51]* |
4.74 [2.51-8.95]* |
| 31-32 |
32 |
9.8 |
10 |
11 |
1.12 [0.55-2.28] |
68.15 [45.91-101.16]* |
4.14 [2.00-8.59]* |
| 33-34 |
46 |
6.4 |
26 |
12.8 |
2.00 [1.24-3.24]* |
44.27 [31.33-62.55]* |
4.82 [2.80-8.30]* |
| 35-36 |
78 |
2.3 |
39 |
4.9 |
2.14 [1.46-3.14]* |
15.84 [11.83-21.21]* |
1.84 [1.12-3.02]* |
| 37-38 |
108 |
0.3 |
26 |
2.77 |
65 [4.99-11.74]* |
2.41 [1.84-3.14]* |
1.00 Reference |
| ≥39 |
107 |
0.1 |
6 |
5 |
34.52 [15.17-78.57]* |
1.00 Reference |
1.87 [0.77-4.56 |
| Q20-Q28 |
|
|
|
|
|
|
|
| <31 |
433 |
89.8 |
118 |
99 |
1.10 [0.90-1.35] |
31.32 [28.23-34.74]* |
17.20 [8.02-36.88]* |
| 31-32 |
158 |
48.5 |
31 |
34.1 |
0.70 [0.48-1.03] |
16.85 [14.33-19.82]* |
5.88 [2.59-13.36]* |
| 33-34 |
243 |
33.7 |
29 |
14.3 |
0.42 [0.29-0.62]* |
11.70 [10.2413.36]* |
2.46 [1.08-5.61]* |
| 35-36 |
529 |
15.5 |
47 |
5.9 |
0.38 [0.51-0.58]* |
5.37 [4.88-5.90]* |
1.01 [0.46-2.24] |
| 37-38 |
1589 |
5.1 |
64 |
6.5 |
1.28 [0.997-1.64] |
1.77 [1.66-1.89]* |
1.13 [0.52-2.46] |
| ≥39 |
2144 |
2.9 |
7 |
5.8 |
2.01 [0.96-4.22] |
1.00 Reference |
1.00 Reference |
| Q90-Q99 |
|
|
|
|
|
|
|
| <31 |
125 |
25.9 |
11 |
9.2 |
0.36 [0.19-0.66]* |
33.56 [27.65-40.73]* |
11.13 [1.44-86.20]* |
| 31-32 |
155 |
47.6 |
2 |
2.2 |
0.05 [0.01-0.19]* |
61.76 [51.70-73.77]* |
2.65 [0.24-29.22] |
| 33-34 |
221 |
30.7 |
11 |
5.4 |
0.18 [0.10-0.32]* |
39.74 [34.02-46.42]* |
6.52 [0.84-50.52] |
| 35-36 |
431 |
12.6 |
10 |
1.3 |
0.10 [0.05-0.19]* |
16.33 [14.41-18.50]* |
1.51 [0.19-11.79] |
| 37-38 |
708 |
2.3 |
11 |
1.1 |
0.49 [0.27-0.90]* |
2.94 [2.64-3.28]* |
1.35 [0.17-10.49] |
| ≥39 |
574 |
0.8 |
1 |
0.8 |
1.07 [0.15-7.62] |
1.00 Reference |
1.00 Reference |
| Q00-Q99 |
|
|
|
|
|
|
|
| <31 |
996 |
206.5 |
222 |
186.2 |
0.90 [0.78-1.04] |
45.23 [42.12-48.56]* |
14.27 [8.59-23.72]* |
| 31-32 |
596 |
183 |
66 |
72.5 |
0.39[0.30-0.51]* |
39.98 [36.63-43.64]* |
5.50 [3.18-9.49]* |
| 33-34 |
922 |
128 |
96 |
47.2 |
0.37 [0.30-0.45]* |
27.81 [25.85-29.91]* |
3.57 [2.10-6.06]* |
| 35-36 |
1667 |
48.8 |
153 |
19.2 |
0.39 [0.33-0.46]* |
10.53 [9.93-11.16]* |
1.44 [0.86-2.42] |
| 37-38 |
3327 |
10.7 |
147 |
15 |
1.40 [1.20-1.66]* |
2.30 [2.19-2.41]* |
1.13 [0.68-1.90] |
| ≥39 |
3455 |
4.7 |
16 |
13.3 |
2.85 [1.74- 4.66]* |
1.00 Reference |
1.00 Reference |
1IMR per 10000 live births; CI: Confidence Interval; *Significant at the 5% level
|
