Table 4.

Psychological outcomes in the negative test (−ve) and CGs (no test) from 1 to 12 months

	1m			3m			6m			12m
	−ve test, M (SD)	No test, M (SD)	Adj. diff. in means [95% CI]	−ve test, M (SD)	No test, M (SD)	Adj. diff. in means [95% CI]	−ve test, M (SD)	No test, M (SD)	Adj. diff. in means [95% CI]	−ve test, M (SD)	No test, M (SD)	Adj. diff. in means [95% CI]	P-value diff. between groups over time
PANAS positive	31.82 (8.19)	30.61 (8.50)	1.52 [0.43, 2.61]	30.91 (8.29)	30.00 (8.39)	1.43 [0.33, 2.53]	31.10 (8.40)	30.15 (9.25)	1.27 [0.17, 2.37]	30.90 (8.27)	30.43 (9.49)	1.03 [−0.09, 2.14]	0.80
PANAS negative	16.36 (7.45)	16.94 (7.53)		15.94 (6.94)	17.29 (7.83)		16.55 (7.33)	17.03 (8.00)		16.54 (7.01)	16.97 (8.10)
PANAS negative (log)	2.71 (0.38)	2.75 (0.39)	−0.05 [−0.11, 0.01]	2.69 (0.37)	2.76 (0.40)	−0.08 [−0.13, −0.02]	2.73 (0.38)	2.75 (0.40)	−0.02 [−0.08, 0.04]	2.73 (0.38)	2.74 (0.41)	−0.03 [−0.09, 0.03]	0.09
LCWS—impact	3.27 (1.62)	3.28 (1.63)	−0.13 [−0.33, 0.07]	3.17 (1.62)	3.31 (1.60)	−0.27 [−0.48, −0.07]	3.30 (1.69)	3.30 (1.64)	−0.17 [−0.37, 0.04]	3.32 (1.77)	3.35 (1.60)	−0.19 [−0.40, 0.01]	0.48
	−ve test, N (%)	No test, N (%)	OR [95% CI]	−ve test, N (%)	No test, N (%)	OR [95% CI]	−ve test, N (%)	No test, N (%)	OR [95% CI]	−ve test, N (%)	No test, N (%)	OR [95% CI]
LCWS—frequency	201 (57.59)	214 (62.76)	0.66 [0.35, 1.23]	185 (55.72)	207 (62.35)	0.49 [0.26, 0.92]	181 (56.39)	204 (62.01)	0.56 [0.29, 1.07]	178 (56.87)	196 (61.64)	0.59 [0.31, 1.14]	0.86
LCWS—worry	47 (13.51)	52 (15.25)	0.63 [0.28, 1.39]	53 (16.01)	56 (16.92)	0.69 [0.32, 1.51]	60 (18.69)	57 (17.48)	0.92 [0.43, 1.98]	63 (20.32)	68 (21.52)	0.65 [0.31, 1.37]	0.80

Adjusted for study site (Greater Glasgow and Clyde, Tayside), minimization variables (age group, gender and smoking history) and baseline values where measured. M = mean. 1m = 1 month, 3m = 3 months, 6m = 6 months, 12m = 12 months