Table 5.

Repeated measures general linear model (GLM) for the effect of group, NRS 48 cough, duration of surgery, and age at each time point on NRS scores at 3, 6, and 12 months

	Df	SS	MS	F	p
NRS 3 months
Intercept	1	2.11	2.11	0.61	0.44
Group	2	20.77	10.39	2.97	0.06
NRS48 cough	1	27.96	27.96	8.00	0.01
Duration	1	0.87	0.87	0.27	0.62
Age	1	11.10	11.10	3.18	0.08
Error	68	237.65	3.50
Total	73	300.72
NRS 6 months
Intercept	1	4.08	4.08	2.66	0.11
Group	2	9.78	4.90	3.19	< 0.05
NRS48 cough	1	9.26	9.26	6.05	0.02
Duration	1	0.06	0.06	0.04	0.85
Age	1	8.74	8.74	5.71	0.02
Error	68	104.12	1.53
Total	73	134.66
NRS 12 months
Intercept	1	1.37	1.37	1.75	0.19
Group	2	2.78	1.39	1.78	0.18
NRS48 cough	1	7.74	7.74	9.89	< 0.01
Duration	1	0.51	0.51	0.66	0.42
Age	1	2.28	2.28	2.91	0.09
Error	68	53.20	0.78
Total	73	66.28

df degrees of freedom, SS sum of squares, MS mean squares, F F test