Table 4.

Trial end points II, binary data.

	Active %	Sham %	Odds ratio	95% CI (exact)	p-value (χ2 test)
Pain relief % at two hours, average of both attacks	60	29	3.75	0.86–16.97	0.043 +
Pain relief % at two hours, first attack	45	27	2.22	0.27–19.76	0.38
Pain relief % at two hours, second attack	78	30	8.17	0.75–113.44	0.037 +
Pain freedom % at two hours, average of both attacks	15	14	1.06	0.12–9.03	0.95
Pain freedom % at two hours, first attack	9	18	0.45	0.01–10.42	0.53
Pain freedom % at two hours, second attack	22	10	2.57	0.11–168.26	0.47

⁺Statistically significant at the 5% level.