Biodemographic Analysis of Factors Related to Perinatal Mortality in Portugal (1988–2011)
Table 5
(a) 1988–95 and 2010-11 forward (Wald) binary logistic regression parameters. Dependent variable: early neonatal deaths. (b) 1988–95 and 2010-11 forward (Wald) binary logistic regression parameters. Dependent variable: perinatal deaths.
(a)
Covariable
df
With multiple
Only single
Wald
OR
Wald
OR
Multiple (S)
1
37
1.439
—
—
—
Sex (female)
1
69
1.312
67
1.322
BW (2500–4000)
3
3158
3030
>4000
1
47
1.747
41
1.692
1500–2499
1
1914
7.970
1973
8.429
<1500
1
2852
34.038
2588
32.901
Mat. age (<20)
3
292
266
20–29
1
1
ns
0.943
1
ns
0.947
30–39
1
29
1.389
31
1.421
40–49
1
117
0.335
97
0.358
Weeks (37–41)
3
1552
1463
>41
1
135
3.177
136
3.197
32–36
1
637
3.208
649
3.304
22–31
1
1437
11.481
1318
11.451
Parity (>1)
1
5
0.925
3
ns
0.940
Year (1988)
1
590
0.930
503
0.930
Nagelkerke
0.336
0.312
Left, duration of gestation ≥22 weeks. In parentheses the category of reference (S: single; BW: birth weight; weeks: duration of gestation). df = degrees of freedom; = statistical significance < 0.05, < 0.01, ns nonsignificant. OR = relative risk. Wald values taken to the nearest integer. Nagelkerke corrected for total and single deliveries.
(b)
Covariable
df
With multiple
Only single
Wald
OR
Wald
OR
Multiple (S)
1
3
ns
1.084
—
—
—
Sex (female)
1
44
1.150
46
1.152
BW (2500–4000)
3
9365
8903
>4000
1
238
2.058
252
2.100
1500–2499
1
5854
8.899
5454
8.108
<1500
1
8017
41.130
7701
36.051
Mat. age (<20)
3
788
848
20–29
1
4
ns
1.076
5
1.085
30–39
1
197
1.790
239
1.884
40–49
1
105
0.535
83
0.577
Weeks (37–41)
3
3472
3541
>41
1
288
2.911
289
2.915
32–36
1
1980
3.412
1938
3.362
22–31
1
2888
9.081
3.018
9.317
Parity (>1)
1
0
ns
1.005
57
1.184
Year (1988)
1
1384
0.932
1554
0.929
Nagelkerke
0.360
0.350
Left, duration of gestation ≥22 weeks. In parentheses the category of reference (S: single; BW: birth weight; weeks: duration of gestation). df = degrees of freedom; = statistical significance < 0.05, < 0.01, ns nonsignificant. OR = relative risk. Wald values taken to the nearest integer. Nagelkerke corrected for total and single deliveries.
