Table 4.

Conditional logistic regression: univariate analysis.

	Unadjusted point estimate^a
Covariates	Point estimate	95% CI	P value^a
Race(ref = other)	NA	NA	NA^a
Height (cm)	0.98	0.88,1.10	0.74
Weight (kg)	0.88	0.68,1.15	0.36
BSA	NA	NA	_NA ^a
BMI	0.86	0.63,1.18	0.34
Temperature in arrival (C)	0.43	0.12,1.49	0.18
Respiratory rate	1.002	0.93,1.08	0.96
Heart rate	1.07	0.99,1.14	0.08
Total dose levalbuterol given in ED and hospital (mg)	2.001	0.901,4.44	0.09
Levalbuterol doses	1.55	0.94,2.56	0.09
Total dose of albuterol in ED and hospital (mg)	0.997	0.99,1.01	0.66
Albuterol doses	0.994	0.97,1.02	0.66
Levalbuterol plus albuterol doses	0.995	0.97,1.02	0.70
Beta agonist doses/time	2.38	0.99,5.75	0.053
Number of chronic asthma control medications	0.91	0.40,2.07	0.81
Number of days of illness prior to presentation	0.47	0.18,1.25	0.13
Use albuterol at home(ref = no)	0.15	0.017,1.31	0.08
Use levalbuterol at home(ref = no)	NA	NA	NA^a
History of diagnosed asthma(ref = no)	0.59	0.11,3.15	0.54
History of documented SVT(ref = no)	NA	NA	NA^a
Family history of arrhythmia(ref = no)	NA	NA	NA^a
History of CHD(ref = no)	1.62	0.14,18.63	0.70

Note: conditional logistic regression is conducted to evaluate the likelihood of having SVT.

The model was not converged due to insufficient sample size of case.