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Table 1 Descriptive analysis of subjects’ ages at the time of initiating protraction (T1, years), and sex

From: Comparison of anchorage reinforcement with temporary anchorage devices or a Herbst appliance during lingual orthodontic protraction of mandibular molars without maxillary counterbalance extraction

 

Valid N

Mean age (Y)

SD

Minimum

Maximum

Median

Females

15

16.74

2.19

13.417

20.99

16.34

Males

12

16.29

1.28

14.845

19.73

16.14

All Groups

27

16.54

1.82

13.417

20.99

16.14

Herbst

15

16.43

1.63

14.798

20.57

16.14

TAD

12

16.68

2.11

13.417

20.99

16.39

All Groups

27

16.54

1.82

13.417

20.99

16.14

  1. No significant difference in subjects’ age distribution was found between male and female subjects (unpaired t-test, p = 0.51) or between the Herbst or TAD group (unpaired t-test, p = 0.74). Also, no significant difference in subjects’ sex distribution was found between the Herbst and TAD groups (Fisher’s exact test, p = 0.7)