Table 4.

Likelihood of specific perinatal and mortality outcomes and smoking status at first booking

Smoking status at first booking	N	Column %	Row %	All infants (N)	Crude HR	Adjusted* HR	PAF (%)
					HR (95% CI)	HR (95% CI)
Bacterial meningitis	1251	100.0	0.2	697 003
Never smoked	525	42	0.1	391 861	1.00 (reference)	1.00 (reference)	11.8
Current smoker	450	36	0.3	159 819	2.09 (1.84 to 2.37)	1.49 (1.30 to 1.71)
Former smoker	125	10	0.2	59 326	1.57 (1.29 to 1.91)	1.35 (1.11 to 1.64)
Unknown/missing	151	12	0.2	85 997	1.34 (1.11 to 1.60)	1.29 (1.06 to 1.57)
Acute and chronic otitis media and mastoiditis	8879	100.0	1.3	697 003
Never smoked	4866	55	1.2	391 861	1.00 (reference)	1.00 (reference)	1.7
Current smoker	2148	24	1.3	159 819	1.05 (1.00 to 1.11)	1.07 (1.02 to 1.14)
Former smoker	755	9	1.3	59 326	1.02 (0.94 to 1.10)	1.01 (0.94 to 1.10)
Unknown/missing	1110	13	1.3	85 997	1.10 (1.03 to 1.18)	1.13 (1.06 to 1.22)
Bronchopulmonary dysplasia	358	100.0	0.1	697 003
Never smoked	141	39	0.0	391 861	1.00 (reference)	1.00 (reference)	10.1
Current smoker	109	30	0.1	159 819	1.90 (1.48 to 2.44)	1.50 (1.15 to 1.96)
Former smoker	22	6	0.0	59 326	1.03 (0.66 to 1.61)	0.90 (0.57 to 1.42)
Unknown/missing	86	24	0.1	85 997	2.79 (2.13 to 3.65)	3.21 (2.45 to 4.22)
Long bone fracture	5757	100.0	0.8	697 003
Never smoked	3156	55	0.8	391 861	1.00 (reference)	1.00 (reference)	−1.5
Current smoker	1466	25	0.9	159 819	1.11 (1.04 to 1.18)	0.94 (0.88 to 1.01)
Former smoker	532	9	0.9	59 326	1.11 (1.01 to 1.21)	1.06 (0.96 to 1.16)
Unknown/missing	603	10	0.7	85 997	0.93 (0.85 to 1.02)	0.92 (0.83 to 1.01)

*Adjusted for: maternal age; infant gender, SIMD; mothers socioeconomic status; fathers socioeconomic status; parity; mode of delivery, infant feeding at 6–8 weeks and country of birth.

PAF, population attributable fraction; SIMD, Scottish Index of Multiple Deprivation.