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Table 1 Summary statistics (means, SD in parentheses) of the retention and non-retention groups

From: Does fixed retention prevent overeruption of unopposed mandibular second molars in maxillary first molar extraction cases?

  Retention group (n=30) Non-retention group (n=35)
Males 18 19
Females 12 16
Age at T1 (years) 15.2 (1.6) 16.2 (1.7)
Age at T2 (years) 17.6 (1.7) 18.6 (2.0)
T2-T1 interval (years) 2.4 (0.8) 2.4 (0.9)