| Maternal age (years) |
Induced LPD |
Spontaneous LPD |
Term deliveries |
Induced LPD vs Term deliveries |
Spontaneous LPD vs Term deliveries |
| No. |
(%) |
No. |
(%) |
No. |
(%) |
OR |
(95% CI) * |
OR |
(95% CI) * |
| ≤ 30 |
41 |
32.3 |
41 |
23.0 |
82 |
30.5 |
1.00 |
|
1.00 |
|
| 31-34 |
23 |
18.1 |
43 |
24.2 |
72 |
26.8 |
0.80 |
0.41-1.57 |
1.31 |
0.74-2.31 |
| ≥ 35 |
49 |
38.6 |
53 |
29.8 |
103 |
38.3 |
1.11 |
0.41-1.57 |
1.10 |
0.64-1.87 |
| Missing |
14 |
11.0 |
41 |
23.0 |
12 |
4.5 |
|
|
|
|
| Education(years) |
|
| ≤ 8 |
25 |
19.7 |
28 |
15.7 |
44 |
16.4 |
1.00 |
|
1.00 |
|
| 9-13 |
38 |
29.9 |
42 |
23.6 |
85 |
31.6 |
0.79 |
0.39-1.61 |
0.80 |
0.41-1.54 |
| ≥ 14 |
23 |
18.1 |
20 |
11.2 |
50 |
18.6 |
0.88 |
0.39-2.01 |
0.84 |
0.39-1.84 |
| Missing |
41 |
32.3 |
88 |
49.4 |
90 |
33.5 |
|
|
|
|
| Marital status |
|
| Never married |
20 |
15.7 |
35 |
19.7 |
43 |
16.0 |
1.00 |
|
1.00 |
|
| Ever Married |
93 |
73.2 |
110 |
61.8 |
207 |
77.0 |
0.88 |
0.45-1.70 |
0.62 |
0.36-1.07 |
| Missing |
14 |
11.0 |
33 |
18.5 |
19 |
7.1 |
|
|
|
|
| BMI |
|
| ≤ 24 |
29 |
22.8 |
44 |
24.7 |
76 |
28.3 |
1.00 |
|
1.00 |
|
| 24.1-27.5 |
33 |
26.0 |
40 |
22.5 |
73 |
27.1 |
1.23 |
0.64-2.37 |
1.06 |
0.60-1.89 |
| ≥ 27.6 |
38 |
29.9 |
40 |
22.5 |
77 |
28.6 |
0.79 |
0.40-1.55 |
0.99 |
0.56-1.76 |
| Missing |
27 |
21.3 |
54 |
30.3 |
43 |
16.0 |
|
|
|
|
| Spontaneous abortion |
|
| 0 |
36 |
28.3 |
38 |
21.3 |
73 |
27.1 |
1.00 |
|
1.00 |
|
| 1 |
70 |
55.1 |
104 |
58.4 |
138 |
51.3 |
0.82 |
0.47-1.44 |
1.09 |
0.65-1.83 |
| ≥2 |
21 |
16.5 |
36 |
20.2 |
58 |
21.6 |
0.49 |
0.24-1.04 |
1.06 |
0.57-1.98 |
| Induced abortions |
|
| 0 |
109 |
85.8 |
162 |
91.0 |
237 |
88.1 |
1.00 |
|
1.00 |
|
| ≥ 1 |
18 |
14.2 |
16 |
8.99 |
32 |
11.9 |
0.87 |
0.44-1.72 |
1.38 |
0.68-2.78 |
| Parity |
|
| 0 |
82 |
64.6 |
101 |
56.7 |
141 |
52.4 |
1.00 |
|
1.00 |
|
| 1 |
36 |
28.3 |
49 |
27.5 |
94 |
34.9 |
0.48 |
0.28-0.84 |
0.60 |
0.37-0.97 |
| ≥ 2 |
9 |
7.1 |
28 |
15.7 |
34 |
12.6 |
0.29 |
0.12-0.72 |
0.86 |
0.46-1.61 |
| History of preterm birth |
|
| No |
109 |
85.8 |
158 |
88.8 |
250 |
92.9 |
1.00 |
|
1.00 |
|
| Yes |
18 |
14.2 |
20 |
11.2 |
19 |
7.1 |
2.44 |
1.11-5.39 |
2.37 |
1.14-4.89 |
| Smoking in pregnancy |
|
| No |
103 |
81.1 |
143 |
80.3 |
208 |
77.3 |
1.00 |
|
1.00 |
|
| Yes |
12 |
9.4 |
23 |
12.9 |
40 |
14.9 |
0.57 |
0.26-1.24 |
0.73 |
0.39-1.36 |
| Missing |
12 |
9.4 |
12 |
6.7 |
21 |
7.8 |
0.86 |
0.37-2.03 |
0.91 |
0.41-2.02 |
| N. Cigarettes/die |
|
| ≤ 4 |
4 |
36.4 |
10 |
50.0 |
18 |
48.6 |
1.00 |
|
1.00 |
|
| ≥ 5 |
7 |
63.6 |
10 |
50.0 |
19 |
51.4 |
1.26 |
0.21-7.57 |
1.55 |
0.29-8.23 |
*multivariate estimates including terms for age, parity, history of LPB, hypertension, culture for vaginal infection in pregnancy |
