borderline significantP = 0.07
In stratified analyses, the pooled rates of population-based studies were comparable across strata defined by most study characteristics, including the language of publication (5.1% for studies published in English and 4.8% for studies published in Chinese; P for subgroup difference = 0.62), while there was a borderline significant difference among studies from different geographic regions ( P = 0.07) (eTable 4 ).