Behavioural and demographic predictors of adherence to three consecutive faecal occult blood test screening opportunities: a population study

Table 7 Multivariate predictors of non-adherence relative to consistent re-participation including a measure of prior satisfaction with FOBT

Variable		Drop out n = 40^a			Intermittent re-participation n = 31^a			Delayed entry n = 81^a			Consistent refusal n = 76^a
		RR	p	95% CI	RR	p	95% CI	RR	p	95% CI	RR	p	95% CI
Behavioural (social cognitive and satisfaction)	Barriers	1.07	.112	(0.98-1.17)							1.00	.873	(0.93-1.06)
	Benefits										1.01	.936	(0.89-1.14)
	Self-efficacy	1.00	.965	(0.94-1.17)							1.00	.847	(0.96-1.05)
	Response efficacy										0.94	.333	(0.82-1.07)
	Social support										1.02	.455	(0.97-1.08)
	Social influence										0.94	.186	(0.86-1.03)
	Satisfaction	0.60	<.001	(0.46-0.78)	0.99	.960	(0.66-1.48)	0.78	.008	(0.65-0.94)	0.74	.005	(0.60-0.92)
Background	Known CRC (yes) ^b										0.80	.348	(0.51-1.27)
	Discussed FOBT (yes) ^b	0.84	.642	(0.40-1.75)							0.82	.465	(0.50-1.37)
	Known screener (yes) ^b	1.20	.582	(0.62-2.31)				0.76	.183	(0.51-1.14)	0.74	.153	(0.49-1.11)
	GP visits				0.64	<.001	(0.51-0.82)
	knowledge (incorrect) ^c										1.27	.458	(0.67-2.40)
	Other screening (yes) ^b										0.97	.891	(0.63-1.50)
Demographic	Age	0.99	.654	(0.93-1.05)	0.96	.218	(0.89-1.03)	0.93	<.001	(0.89-0.97)	0.97	.209	(0.93-1.02)
	Workforce (yes) ^b	1.92	.067	(0.95-3.84)	1.49	.256	(0.75-3.00)	1.41	.198	(0.84-2.39)	1.73	.054	(0.99-3.03)
	Married (yes) ^b	0.95	.896	(0.45-1.95)							0.98	.918	(0.61-1.57)
	Gender (male) ^d							2.00	.002	(1.30-3.10)
	Disadvantage (1)										0.49	.050	(0.24-1.00)
	Disadvantage (2)										0.66	.155	(0.37-1.17)
	Disadvantage (3)										0.41	.023	(0.19-0.88)
	Disadvantage (4) ^e										0.48	.032	(0.25-0.94)

Note. RR= risk ratio; p= probability, 95% CI= confidence interval.Social cognitive variables, satisfaction, GP visits and age were measured on increasing, continuous scales. Health insurance was not included as a predictor in secondary analyses as cell sizes were <5 for drop out participants with only ancillary and only hospital cover.
knowledge= response to knowledge item regarding the importance of repeated screening; Known CRC= known a person who has had CRC; Discussed FOBT= ever discussed FOBT screening; Known a screener= known a person who has screened for CRC; Other screening= ever participated in other (not CRC) screening tests. ^a Cases with missing data were removed list wise, group totals reported in the table report the number of participants included in each analysis. ^b Reference category is ‘no’ ^c reference category is ‘correct’; ^d Reference category is ‘female’; ^e Reference category is the fifth quintile of disadvantage (least disadvantage).

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