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Progress in Orthodontics

Table 2 Age and gender distribution of subjects for the groups

From: A two-year comparative assessment of retention of arch width increases between modified vacuum-formed and Hawley retainers: a multi-center randomized clinical trial

Variable

HR group (n = 17)

mVFR group (n = 18)

Total (n = 35)

P value

Age at debond (mean ± SD)

21.88 ± 4.12

22.06 ± 5.88

21.97 ± 5.03

.92

Gender: n (%)

   

.56

Male

5 (29)

7 (39)

12 (34)

 

Female

12 (71)

11 (61)

23 (66)

 
  1. HR indicates Hawley retainer; mVFR, modified vacuum-formed retainer; SD, standard deviation; n, sample size
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