Table 1. Comparison of Mean Headache After Spinal Anesthesia in the Case and Control Groups.

Headache Time, Group	Number	Average Rating	P Value
Immediately after surgery			0.001
Ketamine	32	22.73
Normal saline	32	43.59
4 hours			0.002
Ketamine	32	29
Normal saline	32	37.13
12 hours			0.528
Ketamine	32	32.47
Normal saline	32	33.55
24 hours			0.528
Ketamine	32	32.47
Normal saline	32	33.55