Cruciate retaining total knee arthroplasty has a better 10 year survival than posterior stabilized total knee arthroplasty: a systematic review and meta-analysis

Table 2 Subgroup analysis of OR in terms of survivorship outcome

Subgroups	No. of studies	Odds Ratio (95% confidence interval)	P-value	Test for subgroup analysis
Geographic origin
Europe	3	1.49 (0.70–3.14)	0.30	Chi² = 3.15, P = 0.21, I² = 36.4%
America	3	2.68 (2.06–3.48)	< 0.0001
Asia	1	1.68 (0.80–3.52)	0.17
Period of publication
Before 2011	2	2.67 (2.05–3.48)	< 0.0001	Chi² = 4.64, P = 0.03, I² = 78.4%
After 2011	5	1.53 (0.99–2.36)	0.05	Chi² = 4.64, P = 0.03, I² = 78.4%
Survival follow-up period
10 years	5	2.22 (1.46–3.39)	0.0002	Chi² = 0.24, P = 0.63, I² = 0%
15 years	4	2.48 (2.19–2.81)	< 0.0001	Chi² = 0.24, P = 0.63, I² = 0%