Global prevalence of molar incisor hypomineralisation

Data sourcesPubMed, Web of Science, ScienceDirect, Chinese Biological Medical Literature Database, Chinese Wanfang Database, Chinese National Knowledge Infrastructure and reference lists of key publications. Language restrictions were placed with inclusion of English and Chinese texts only. No date restrictions were applied.Study selectionOriginal population-based studies that described the diagnostic criteria of MIH and provided prevalence data or sufficient information that could be used to calculate MIH prevalence.Data extraction and synthesisTwo reviewers independently extracted the data. Meta-regression was done using a random effects model for parameters of age, gender and region. Heterogeneity was assessed using I² statistic.ResultsSeventy studies were included that encompassed a total of 89,520 people and 10,823 cases of MIH. The pooled global prevalence of MIH was 14.2% (95% CI 12.6-15.8), with South America having the highest prevalence (18%; 95% CI 13.8-22.2) and Africa the lowest (10.9%; 95% CI 4.2-17.6). There was no significant difference between male and female participants. Prevalence of MIH amongst children ten years of age or younger (15.1%, 95% CI 12.1-18.2) was higher than older children (12.1%, 95% CI 8.0-16.3).ConclusionsThis meta-analysis showed the average global prevalence of MIH as 14.2%. Some geographic regions had higher than average prevalence, which could inform oral health policy in those areas.