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Table 2 Univariable analysis of clinical and socio-demographic factors associated with stillbirth (n = 53,293)

From: Ethnic variation in stillbirth risk and the role of maternal obesity: analysis of routine data from a London maternity unit

   Total births Stillbirths Crude OR (95% CI) p value
n = 53293 (%) n = 329 (%)   
Ethnicity White 26,390 (49.5) 99 (30.1) ref  
Black 17,337 (32.5) 157 (47.7) 2.43 (1.88-3.13) <0.001
Asian 2,957 (5.5) 27 (8.2) 2.45 (1.60-3.75) <0.001
Other 5,790 (10.9) 40 (12.2) 1.85 (1.27-2.69) 0.001
Missing 813 (1.5) 6 (1.8)   
Deprivation (IMD) Quintile 1 (least deprived) 1,636 (3.1) 7 (2.1) 0.64 (0.30-1.37) 0.25
Quintile 2 3,056 (5.7) 16 (4.9) 0.78 (0.46-1.32) 0.36
Quintile 3 6,072 (11.4) 31 (9.4) 0.76 (0.51-1.14) 0.19
Quintile 4 23,997 (45.0) 151 (45.9) 0.94 (0.74-1.20) 0.64
Quintile 5 (most deprived) 18,147 (34.1) 121 (36.8) ref  
Missing 385 (0.7) 3 (0.9)   
Maternal age <20 yrs 2,041 (3.8) 11 (3.3) 0.84 (0.44-1.58) 0.58
20-24 yrs 7,217 (13.5) 39 (11.9) 0.84 (0.56-1.24) 0.38
25-29 yrs 12,125 (22.8) 78 (23.7) ref  
30-34 yrs 17,473 (32.8) 100 (30.4) 0.89 (0.65-1.20) 0.45
35-39 yrs 11,441 (21.5) 74 (22.5) 1.00 (0.73-1.39) 0.97
40+ yrs 2,996 (5.6) 27 (8.2) 1.40 (0.90-2.18) 0.13
Per year increase in age      1.02 (1.00-1.04) 0.039
BMI Underweight 1,413 (2.7) 7 (2.1) 1.01 (0.47-2.16) 0.98
Recommended 24,423 (45.8) 120 (36.5) ref  
Overweight 10,503 (19.7) 70 (21.3) 1.36 (1.00-1.84) 0.046
Obese 6,339 (11.9) 61 (18.5) 1.97 (1.44-2.68) <0.001
Missing 10,615 (19.9) 71 (21.6) 1.36 (1.02-1.83) 0.04
Parity Nulliparous 30,856 (57.9) 168 (51.1) 1.03 (0.76-1.36) 0.85
Para 1 13,196 (24.8) 70 (21.3) ref  
Para 2+ 9,170 (17.2)   (27.7) 1.88 (1.37-2.57) <0.001
Missing 71 (0.1) 0 (0.0)   
Single status Married or living with partner 38,987 (73.2) 240 (72.9) ref  
Single 14,167 (26.6) 88 (26.7) 1.01 (0.79-1.29) 0.94
Missing 139 (0.3) 1 (0.3)   
Smoking Non-smoker at booking 44,205   278 (84.5) ref  
Smoker at booking 3,327   26 (7.9) 1.01 (0.79-1.29) 0.29
Missing 5,761 (10.8) 25 (7.6)   
Hypertensive disorders No hypertension 50,721 (95.2) 295 (89.7) ref  
Hypertension 2,572 (4.8) 34 (10.3) 2.29 (1.61-3.26) <0.001
Diabetes No diabetes 52,064 (97.7) 317 (96.4) ref  
Diabetes 1,229 (2.3) 12 (3.6) 1.61 (0.90-2.87) 0.11