Table 2.

Comparison of emergency department presentations using negative binomial regression. Patients matched for age, sex, and treatment status.

		Univariate								Multivariable
		RRa		Lower 95% CI		Upper 95% CI		P value		RRa		Lower 95% CI	Upper 95% CI		P value
Group
	Intervention	0.81		0.64		1.04		.10		0.75		0.60	0.95		.02
	Control	Reference		—b		—		—		Reference		—	—		—
Stage								<.001							<.001
	0/I	Reference		—		—		—		Reference		—	—		—
	II	1.50		1.16		1.96		.002		1.50		1.15	1.95		.002
	III	2.93		2.20		3.91		<.001		2.56		1.92	3.43		<.001
	IV	5.80		4.35		7.74		<.001		5.56		4.15	7.45		<.001
	Missing	3.59		2.57		5.02		<.001		3.64		2.62	5.07		<.001
Socioeconomic status (IRSD)c								.02							.003
	1	1.81		1.25		2.61		.002		1.90		1.34	2.70		<.001
	2	1.82		1.25		2.64		.002		1.38		0.96	1.98		.08
	3	1.48		0.99		2.22		.06		1.77		1.21	2.59		.004
	4	Reference		—		—		—		Reference		—	—		—
	5	1.52		1.04		2.24		.03		1.40		0.96	2.03		.08
Recruitment site								<.001							<.001
	1	0.61		0.42		0.89		.01		0.91		0.63	1.32		.63
	2	0.40		0.26		0.61		<.001		0.47		0.31	0.71		<.001
	3	0.44		0.30		0.64		<.001		0.56		0.38	0.81		.002
	4	Reference		—		—		—		Reference		—	—		—
Waiting time			0.9998		0.9997		1.00		<.001		0.9999	0.9998		1.0000		.018

^aRR: Relative risk.

^bNot available.

^cIRSD: Index of relative socioeconomic disadvantage. 1=most disadvantaged; 5=least disadvantaged.