Table 1.

Mean treatment differences between levocetirizine (or diphenhydramine) and placebo in CFF from baseline on day 1 by time-point.

Comparisons	Time	Mean difference and 95% CI (Hz)	P values
Levocetirizine vs placebo	1 h	−0.15 (−1.15, 0.84)	0.764
	2 h	−0.08 (−1.07, 0.92)	0.876
	3 h	−0.81 (−1.80, 0.19)	0.111
	5 h	−0.69 (−1.69, 0.30)	0.168
	12 h	−0.27 (−1.27, 0.72)	0.56
	24 h	−0.34 (−1.34, 0.65)	0.491
Diphenhydramine vs placebo	1 h	−1.04 (−2.03, −0.06)	<0.05
	2 h	−1.14 (−2.13, −0.16)	<0.05
	3 h	−1.62 (−2.61, −0.64)	<0.005
	5 h	−0.71 (−1.70, 0.27)	0.152
	12 h	−0.78 (−1.76, 0.21)	0.120
	24 h	−0.20 (−1.18, 0.78)	0.685