Table 2.

Frequency and independent predictors of discrepant smoking status responses between primary care and self-reported responses (all LHC invitation responders, n=29,698)

	All LHC invitation responders (n) 29,698	Nonconcordant smoking status Records n (%) 7,338 (24.7%)	Unadjusted OR (95% CI)	Adjusted OR (95% CI)
Sex (missing = 1)
Female	12,862	3,151 (24.5)	1.0	1.0
Male	16,835	4,187 (24.9)	1.02 (0.97 – 1.08)	1.16 (1.09 – 1.23)
Male			p=0.452	p<0.001
Age groups (missing = 23)
55-59	9,226	2,341 (25.4)	1.0	1.0
60-64	7,637	1,882 (24.6)	0.96 (0.90 – 1.03)	0.97 (0.90 – 1.05)
60-64			p=0.276	p=0.496
65-69	6,343	1,554 (24.5)	0.95 (0.89 – 1.03)	0.94 (0.87 – 1.03)
65-69			p=0.216	p=0.165
70-75	4,649	1,108 (23.8)	0.92 (0.85 – 1.00)	0.88 (0.80 – 0.97)
70-75			p=0.47	p=0.007
>75	1,820	451 (24.8)	0.97 (0.86 – 1.09)	0.94 (0.82 – 1.07)
>75			p=0.592	p=0.357
Ethnicity (missing = 611)
White
British/mixed British	13,917	3,275 (23.5)	1.0	1.0
Irish	923	210 (22.8)	0.96 (0.82 – 1.12)	0.99 (0.83 – 1.19)
Irish			p=0.588	p=0.934
Other White	4,016	1,041 (25.9)	1.14 (1.05 – 1.23)	1.13 (1.03 – 1.23)
Other White			p=0.002	p=0.009
Asian or Asian
British
Indian or British Indian	1,250	322 (25.8)	1.13 (0.99 – 1.30)	0.89 (0.77 – 1.03)
Indian or British Indian			p=0.076	p=0.128
Pakistani or British Pakistani	531	132 (24.9)	1.08 (0.99 – 1.31)	0.90 (0.72 – 1.12)
Pakistani or British Pakistani			p=0.480	p=0.341
Bangladeshi or British Bangladeshi	1483	412 (27.8)	1.25 (1.11 0 1.41)	0.98 (0.86 – 1.13)
Bangladeshi or British Bangladeshi			p<0.001	p=0.812
Other Asian	761	204 (26.8)	1.19 (1.01 – 1.40)	1.10 (0.92 – 1.32)
Other Asian			p=0.039	p=0.287
Black
Caribbean	1223	338 (28.6)	1.24 (1.09 – 1.42)	1.22 (1.06 – 1.41)
Caribbean			p=0.001	p=0.007
African	736	197 (26.8)	1.19 (1.00 – 1.41)	0.97 (0.81 – 1.17)
African			p=0.045	p=0.764
Other black	523	132 (25.2)	1.1 (0.91 – 1.19)	1.05 (0.85 – 1.32)
Other black			p=0.367	p=0.638
Mixed
White and black Caribbean	182	40 (22.0)	0.92 (0.65 – 1.30)	0.84 (0.57 – 1.25)
White and black Caribbean			p=0.623	p=0.390
White and black African	82	19 (23.2)	0.98 (0.60 – 1.64)	0.66 (0.37 – 1.20)
White and black African			p=0.939	p=0.170
White and Asian	118	28 (23.7)	1.01 (0.66 – 1.55)	0.98 (0.62 – 1.56)
White and Asian			p=0.96	p=0.938
Mixed – other	229	58 (25.3)	1.1 (0.82 – 1.49)	(0.74 – 1.45)
Mixed – other			p=0.526)	p=0.856
Other
Chinese	261	57 (21.8)	0.91 (0.68 – 1.22)	0.81 (0.59 – 1.12)
Chinese			p=0.523	p=0.203
Other	1317	320 (24.3)	1.04 (0.91 – 1.19)	0.97 (0.84 – 1.12)
Other			p=0.532	p=0.707
Not stated	460	126 (27.4)	1.23 (1.00 – 1.51)	1.16 (0.92 – 1.46)
Not stated			p=0.056	p=0.207
Most recent smoking status (missing = 1)
Current	11,859	2,382 (20.1)	1.0	1.0
Former	13,309	2,189 (16.4)	0.78 (0.74 – 0.84)	0.80 (0.75 – 0.86)
Former			p<0.001	p<0.001
Never	3568	1,805 (50.6)	4.07 (3.76 – 4.41)	4.14 (3.80 – 4.51)
Never			p<0.001	p<0.001
Unknown/other	960
National Index of Multiple Deprivation (missing = 392)
Quintile 1 (most deprived)	9,449	2,189 (23.2)	1.0	1.0
Quintile 2	8,601	2,052 (23.9)	1.04 (0.97 – 1.11)	1.00 (0.93 – 1.08)
Quintile 2			p=0.274	p=0.996
Quintile 3	5,291	1,353 (25.6)	1.14 (1.05 – 1.23)	1.09 (0.99 – 1.19)
Quintile 3			p=0.001	p=0.069
Quintile 4	4,361	1,195 (27.4)	1.25 (1.15 – 1.36)	1.16 (1.05 – 1.27)
Quintile 4			p<0.001	p=0.003
Quintile 5 (least deprived)	1,604	464 (28.9)	1.35 (1.20 – 1.52)	1.26 (1.10 – 1.45)
Quintile 5 (least deprived)			p<0.001	p=0.001
Time since status last updated (missing = 24)
<12 months	19,615	4,427 (22.6)	1.0	1.0
12–24 months	4,626	1,259 (27.2)	1.28 (1.19 – 1.39)	1.21 (1.11 – 1.31)
12–24 months			p<0.001	p<0.001
24–36 months	1,980	582 (29.4)	1.43 (1.29 – 1.58)	1.29 (1.15 – 1.45)
24–36 months			p<0.001	p<0.001
>36 months	3,453	1,067 (30.9)	1.53 (1.42 – 1.66)	1.42 (1.29 – 1.56)
>36 months			p<0.001	p<0.001