Table 2.

Adjusted effects of repeated puncture attempt and presence of headache on postdural puncture headache

Risk factor	P-value	AR	95% CI
Repeated puncture
No	Ref	1.00 (Ref)	Ref
Yes	0.03	2.55	1.09–5.93
Presence of headache
No	Ref	1.00 (Ref)	Ref
Yes	<0.001	4.60	2.31–9.15

Notes: Factors in the logistic regression model included needle type, previous spinal anesthesia, previous spinal headache, preeclampsia, migraine, caffeine withdrawal, sinusitis, age, and weight.

Abbreviations: AR, adjusted risk; CI, confidence interval; Ref, reference.