Table.

Odds ratios and confidence intervals in meta-analysis looking at design of spinal needles and headache after lumbar puncture²

	Pooled odds ratio	95% CI
Headache after lumbar puncture:
Non-cutting v cutting needle	0.26	0.11 to 0.62
Small v large needle	0.18	0.09 to 0.36
Failure:
Non-cutting v cutting needle	0.52	0.27 to 1.01*
Small v large needle	NA	0.67 to 2.42*

NA=Not applicable. ^*Not significant.