Table 4.

Full Multivariate model

Covariates	Name	coefficient	Odds Ratio	95 lower	95 upper	P-value
LEVEL ONE
Intercept	theta0	-2.043	0.130	0.096	0.174	0.000
Age & Sex
Females 2 – 4	theta1	1.634	5.125	3.254	8.072	0.000
Females 5 – 9	theta2	0.639	1.896	1.475	2.436	0.000
Females 10 – 14	theta3	0.658	1.931	1.564	2.385	0.000
Females 15–20 (reference)			1
Males 2–4	theta4	1.577	4.843	3.030	7.740	0.000
Males 5–9	theta5	0.919	2.508	2.013	3.125	0.000
Males 10–14	theta6	0.691	1.997	1.649	2.417	0.000
Males 15–20	theta7	0.532	1.703	1.413	2.053	0.000
Complications (binary)
Other infection	theta8	1.889	6.611	5.392	8.106	0.000
Digestive Disorder	theta9	0.775	2.170	1.835	2.566	0.000
Pregnancy	theta10	-1.173	0.310	0.189	0.508	0.000
Congenital Digestive	theta11	-0.717	0.488	0.234	1.020	0.056
Insurance
Medicaid insurance	theta12	-0.006	0.994	0.796	1.242	0.960
HMO insurance	theta13	-0.135	0.874	0.691	1.105	0.262
Other insurance	theta14	-0.023	0.977	0.740	1.290	0.870
Private insurance	theta15	-0.051	0.951	0.776	1.165	0.625
Self insured (reference)			1
LEVEL TWO
ZIP code of residence	b00					0.316
Deprivation index	G01	0.035	1.036	0.969	1.107	0.301
Appendectomy rate	G04	0.009	1.009	0.997	1.022	0.135
Rural – Urban Area	G02	0.737	2.090	1.038	4.209	0.039
Rural – Urban Cluster	G03	0.374	1.453	0.955	2.212	0.081
Other RUCA			1
OHA Hospital	c00					0.000
Children's Hospital	B05	0.640	1.896	1.243	2.894	0.003
JCAHO accreditation	B01	0.152	1.164	0.942	1.438	0.158
Critical Access designation	B02	-0.009	0.991	0.708	1.388	0.959
Total number of appendectomies	B03	-0.001	0.999	0.998	1.001	0.347
Located in small town	B04	-0.150	0.861	0.607	1.22	0.400
Percent of app. with other infection	B06	0.000	1.000	0.989	1.012	0.985