The baseline data
308 eligible schoolchildren were recruited for this investigation and randomly allocated to Orth-K group (n=154) and SVS group groups (n=154). A total of 279 subjects completed the 13-month follow-up (142 in Orth-K group and 137 in SVS group).No statistical difference in age, gender, equivalent spherical degree, and AL between Orth-K and SVS groups before treatment was noted (p > 0.05, Table 