Table 3.

Parameter estimate of the fitted model for post ECT headache

Variable	Estimate	Standard error	t value	P value
Initial model
Intercept	5.12	2.53	2.03	<0.001
Age group: 1 vs 2	−0.09	0.44	−0.21	0.834
Age group: 1 vs 3	1.03	0.62	1.66	0.097
Employement	0.69	0.42	1.66	0.974
History of migranous headache	−0.89	0.94	−0.95	0.341
Headache during episode	−1.57	0.87	−1.80	0.0719
Acetaminophen	−1.42	0.42	−3.42	<0.001
Final model
Intercept	0.92	0.28	3.26	<0.001
Acetaminophen	−1.47	0.39	−3.81	<0.001

Age group 1: 18 to 40 years; Age group 2: 41 to 60; Age group 3: over 60 years