Comparison 11. Intrathecal morphine and PCA morphine versus PCA morphine.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Incident delirium	1	52	Risk Ratio (M‐H, Random, 95% CI)	0.9 [0.44, 1.85]
2 Length of admission	1	52	Mean Difference (IV, Random, 95% CI)	‐0.5 [‐1.51, 0.51]
3 Cognition ‐ days for MMSE to return to preoperative level	1	52	Mean Difference (IV, Random, 95% CI)	0.20 [‐1.03, 1.43]
4 Withdrawal from protocol	1	59	Risk Ratio (M‐H, Random, 95% CI)	0.78 [0.19, 3.17]
5 Mortality	1	59	Risk Ratio (M‐H, Random, 95% CI)	0.34 [0.01, 8.13]