did not reach statistical significanceP value = 0.08
Impact of methodological factors When stratifying by publication period, more recent studies (2016 and above) reported a lower risk of secondary collapse with bone substitutes (RR = 0.98, 95%CI: 0.73, 1.31) compared to earlier studies (2008-2015), which favored autografts (RR = 2.01, 95%CI: 0.98, 4.11), despite that this difference did not reach statistical significance ( P value = 0.08).