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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)