Factors associated with study attrition in a pilot randomised controlled trial to explore the role of exercise-assisted reduction to stop (EARS) smoking in disadvantaged groups

Thompson, T. P.; Greaves, C. J.; Ayres, R.; Aveyard, P.; Warren, F. C.; Byng, R.; Taylor, R. S.; Campbell, J. L.; Ussher, M.; Michie, S.; West, R.; Taylor, A. H.

doi:10.1186/s13063-016-1641-5

Trials

Table 1 Summary of logistic regression analysis for study dropout versus completion

From: Factors associated with study attrition in a pilot randomised controlled trial to explore the role of exercise-assisted reduction to stop (EARS) smoking in disadvantaged groups

	Variable	Number	Odds ratio (95 % CI)
Methods	Trial arm^a
	Intervention	49	1.03 (0.46; 2.32)
	Recruitment avenue^b
	Stop Smoking Services	31	0.81 (0.33; 1.99)
	Community	6	0.74 (0.13; 4.35)
	Recruitment method^c
	Letter plus telephone reminder	38	2.24 (0.95; 5.26)
	Community	6	1.12 (0.19; 6.70)
Demographics	Age (years)	99	0.97 (0.93; 1.01)
	Gender^d
	Female	56	1.55 (0.68; 3.56)
	Body mass index	98	1.01 (0.95; 1.07)
	Employment status^e
	Unemployed	45	1.13 (0.50; 2.55)
	Job status^f
	C2-D	45	1.21 (0.27; 5.50)
	Unemployed	45	1.33 (0.29; 6.03)
	Age left education	99	0.93 (0.73; 1.17)
Smoking-related variables	Years smoking	99	0.98 (0.94; 1.01)
	Previous use of Stop Smoking Services^g
	Have not used Stop Smoking Services in the past	58	1.14 (0.50; 2.60)
	Cigarettes per day	99	1.00 (0.97; 1.03)
	Expired air carbon monoxide (parts per million)	98	1.04 (0.99; 1.09)
	Fagerström Test for Nicotine Dependence	99	1.19 (0.96; 1.46)
	Importance of quitting next 6 months (median)^h
	High importance	49	1.23 (0.54; 2.76)
	Confidence to quit in the next 6 months (median)ⁱ
	High confidence	48	0.43 (0.19; 0.99)
	Confidence to cut down by half in the next month (median)^j
	High confidence	39	1.44 (0.63; 3.28)
Physical activity-related variables	Self-reported ≥30 mins of moderate and vigorous physical activity per day^k
	Yes	65	0.48 (0.20; 1.12)
	Self-reported minutes of moderate and vigorous physical activity per day	99	1.00 (0.99; 1.00)
	Self-reported ≥30 mins moderate and vigorous physical activity on at least 5 days^l
	Yes	43	0.77 (0.34; 1.75)
	Self-reported ≥150 mins moderate and vigorous physical activity per week^m
	Yes	69	0.33 (0.14; 0.81)
	Accelerometer ≥30 mins moderate and vigorous physical activity per dayⁿ
	Yes	32	1.11 (0.42; 2.95)
	Accelerometer minutes moderate and vigorous physical activity per day	66	1.00 (0.98; 1.02)
	Stage of change to use physical activity to control smoking^o
	Planning, action, maintenance	20	0.42 (0.15; 1.40)
	Confidence to exercise for ≥30 mins on most days over next 6 months^p
	High confidence	55	0.83 (0.37; 1.86)
	Confidence to walk for ≥15 mins at a brisk pace^q
	High confidence	59	1.06 (0.47; 2.43)
	Indicated mental health problem^r
	Yes	41	1.49 (0.65; 3.38)

^aReference: control; ^bReference: primary care; ^cReference: letter only; ^dReference: male; ^eReference: employed; ^fReference: social class A–C1; ^gReference: have used SSS in the past; ^hReference: low importance; ⁱReference: low confidence; ^jReference: low confidence; ^kReference: not reporting 30 mins MVPA per day; ^lReference: not completing 30 mins MVPA on at least 5 days per week; ^mReference: not reporting >150 mins MVPA per week; ⁿReference: not completing 30 mins MVPA per day as assessed by accelerometer; ^oReference: pre-contemplation and contemplation; ^pReference: low confidence; ^qReference: low confidence; ^rReference group: no indicated mental health problem

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ISSN: 1745-6215

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