Fig. 1

National identity number (NIN) and date of birth (DoB) from the civil registration enabled the removal of replicate records among the three databases [admitted patient visit (APV), non-admitted patient visit (NAPV), birth defects registry (BDR)]. After verification, the total number of new cases with CL/P was 7,775 during the fiscal years of 2012–2016. A proportionate three-dimensional diagram depicting the number of cases was constructed. The outermost parts show three databases where cases appeared in one database only. The middle layer shows cross-validation using two databases. The innermost triangle signifies the cases captured by all three databases, which show more than half of the total count (56.91%; 4,425 out of 7,775). APV of 6,715 cases demonstrated comprehensive cleft care coverage of 86.37%. The 133 cases (1.71%) recorded solely in the BDR indicate that these patients had never visited the hospitals. The remaining proportion of patients with CL/P who had visited the hospitals at least once was 98.29% or 7,642 out of 7,775 cases