A subgroup analysis showed a decreasing trend in the last 30 years: 1990 to 2000 OPR, 2.06; 95% CI [0.72, 5.87], 2000 to 2010 OPR, 1.24; 95% CI [1.06, 1.45] and 2010‐present OPR, 1.15; 95% CI [0.98, 1.35], P = 0.019 (Figure S2 ).
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A subgroup analysis showed a decreasing trend in the last 30 years: 1990 to 2000 OPR, 2.06; 95% CI [0.72, 5.87], 2000 to 2010 OPR, 1.24; 95% CI [1.06, 1.45] and 2010‐present OPR, 1.15; 95% CI [0.98, 1.35], P = 0.019 (Figure S2 ).