Table 2.

Quit rates based on ITT and CCA for AC and Quit.ie: Using Russell Standard (CO validated) quitting and self-report quitting

Method	Quitting definition	Month	Quit.ie			AC			P values*
			No of quitters	Sample size	Quit rate	No of quitters	Sample size	Quit rate
ITT	Russell Standard	1	30	149	20.1%	57	151	37.7%	<0.001†
		3	22	149	14.8%	40	151	26.5%	0.006†
		6	23	149	15.4%	35	151	23.2%	0.045†
		12	17	149	11.4%	33	151	21.9%	0.008†
	Self-report	1	36	149	24.2%	63	151	41.7%	<0.001†
		3	26	149	17.5%	48	151	31.8%	0.002†
		6	25	149	16.8%	42	151	27.8%	0.011†
		12	21	149	14.1%	36	151	23.8%	0.016†
CCA	Russell Standard	1	30	69	43.5%	57	110	51.8%	0.139
		3	22	46	47.8%	40	81	49.4%	0.433
		6	23	41	56.1%	35	72	48.6%	0.778
		12	17	38	44.7%	33	63	52.4%	0.228
	Self-report	1	36	124	29.0%	63	134	47.0%	0.002†
		3	26	114	22.8%	48	130	36.9%	0.008†
		6	25	108	23.1%	42	120	35.0%	0.025†
		12	21	105	20.0%	36	107	33.6%	0.013†

*The alternative hypothesis is that AC has a higher quit rate than Quit.ie.

†The test is significant at 0.05 level.

AC, Allen Carr’s Easyway to Stop Smoking; CCA, complete case analysis; CO, carbon monoxide; ITT, intention-to-treat.