Table 2.

Multivariate analysis of predictors of operative time

	Coefficient	Standard error	T value	P value
Group	-5.26	1.52	-3.45	0.0008
Severity of appendicitis	7.95	2.53	3.14	0.0021
BMI	1.14	1.78	0.63	0.524
Location of appendix	-0.89	2.75	-0.32	0.746
Past history of abdominal surgery	-2.99	5.01	-0.59	0.552

By the multiple linear regression model: n = 120, residual standard error = 18.6, R ² = 0.126, overall F test statistic = 4.448, P = 0.001 (df = 5, 114)

Abbreviation: BMI body mass index