Can Obstetric Risk Factors Predict Fetal Acidaemia at Birth? A Retrospective Case-Control Study
Table 1
Maternal demographic risk factors.
Maternal demographic risk factors
Non-acidaemia pH > 7.20 (N = 294)
Acidaemia pH < 7.20 (N = 294)
Missing %
p-value
Odds ratios (95% CI)
Maternal age (years) mean ± SD
29 [5.19]
29 [5.82]
0.664
Maternal Age
Reference age
231 (78.8%)
229 (78.2%)
0.3%
REFERENCE
Teenage pregnancy
6 (2.0%)
6 (2.0%)
0.988
1.01 (0.32 - 3.17)
Advanced age I
44 (15.0%)
42 (14.3%)
0.872
0.96 (0.61 - 1.53)
Advanced age II
12 (4.1%)
16 (5.5%)
0.451
1.35 (0.62 - 2.91)
Ethnicity
White
156 (65.3%)
161 (68.5%)
19.4%
REFERENCE
Black
20 (8.4%)
17 (7.2%)
0.58
0.82 (0.42 - 1.63)
Asian
43 (18.0%)
35 (14.9%)
0.350
0.79 (0.48 - 1.30)
Mixed
8 (3.3%)
6 (2.6%)
0.563
0.73 (0.25 - 2.14)
Other
12 (5.0%)
16 (6.8%)
0.520
1.29 (0.59 - 2.82)
BMI (kg/m2) mean ±SD
25.3 [4.95]
25.7 [5.7]
0.496
BMI (kg/m2)
Healthy weight
126 (43.8%)
122 (43.0%)
2.7%
REFERENCE
Underweight
11 (3.8%)
2 (0.7%)
0.032
0.19 (0.04 - 0.87)
Overweight
83 (28.8%)
88 (31.0%)
0.648
1.10 (0.74 - 1.62)
Obesity I
39 (13.5%)
49 (17.3%)
0.296
1.30 (0.80 - 2.12)
Obesity II
23 (8.0%)
11 (3.9%)
0.069
0.49 (0.23 - 1.06)
Obesity III
6 (2.1%)
12 (4.2%)
0.160
2.06 (0.75 - 5.68)
Parity
Nulliparity
182 (63.2%)
169 (59.5%)
2.7%
0.365
0.86 (0.61 - 1.20)
Low multiparity
100 (34.7%)
111 (39.1%)
2.7%
0.280
1.21 (0.86 - 1.70)
High multiparity
6 (2.1%)
4 (1.4%)
2.7%
0.752
0.67 (0.19 - 2.41)
Demographic variables for acidaemia where the cutoff for acidaemia is pH = 7.20. Independent t-test was performed for maternal age and BMI and binary logistic regression was performed for all variables.
