Table 4.

Multivariable Linear Regression Analysis for Operative Time and Length of Hospital Stay

Diagnostic Group	Outcome	Adjusted β for Off-Hours	95% CI	P-Value
Ovarian torsion	Operative time, minutes	−1.04	−24.47 to 22.38	.929
Ovarian torsion	Hospital stay, hours	−4.37	−25.54 to 16.80	.681
Ovarian cyst rupture	Operative time, minutes	−4.29	−24.90 to 16.33	.680
Ovarian cyst rupture	Hospital stay, hours	−3.44	−18.74 to 11.87	.656
Ruptured tubal EP	Operative time, minutes	12.26	3.14 to 21.38	.009
Ruptured tubal EP	Hospital stay, hours	0.05	−5.96 to 6.05	.988

Abbreviation: EP, ectopic pregnancy. β values represent adjusted mean differences for off-hours surgery compared with working-hours surgery. Models were adjusted for age, body mass index, previous abdominal surgery, comorbidity, and surgical approach. Surgical approach was categorized as laparoscopic versus nonlaparoscopic.