Table 2. Clinical outcomes.

			Test statistic
Variable	Controls	Combination therapy	t	χ2	P
no. of patients with headache:
After 1 week of treatment	23	15		4.284	0.038
Two weeks after start of treatment	16	4		6.332	0.012
Mean (s.d.) duration of headache after starting treatment (days)	15.6 (13.4)	8.6 (7.3)	2.661		0.01
Mean (s.d.) no. of acetaminophen tablets taken within 7 days of the start treatment	9.9 (8.6)	6.3 (4.9)	2.152		0.036