Table 4.

Incidence and 95% Confidence Intervals (CIs) of Anesthesia-Related Complications in Labor and Delivery by Selected Circumstances, New York State, 2002–2005

Circumstance	Number of patientsa	Number of patients with complications	Incidence (%)	95% CI
Year
2002	233,502	1001	0.43	0.40–0.46
2003	239,083	1167	0.49	0.46–0.52
2004	244,784	1138	0.46	0.44–0.49
2005	240,102	1132	0.47	0.44–0.50
Admission month
January to March	232,589	1038	0.45	0.42–0.47
April to June	241,883	1145	0.47	0.45–0.50
July to September	250,359	1171	0.47	0.44–0.49
October to December	232,640	1084	0.47	0.44–0.49
Admission day
Weekend	197,527	839	0.42	0.40–0.45
Weekday	759,944	3599	0.47	0.46–0.49
Scheduled admission
Yes	541,900	2774	0.51	0.49–0.53
No	415,571	1664	0.40	0.38–0.42
Rural/urban
Urban	845,050	3771	0.45	0.43–0.46
Rural	89,481	568	0.63	0.58–0.69
Cesarean section
Yes	282,556	2274	0.80	0.77–0.84
No	674,915	2164	0.32	0.31–0.33

^aThe total number of patients within variables may vary because of missing data.