Table 2. General and clinical characterization.
| CF (n = 21) | ECC (n = 32) | P | |
|---|---|---|---|
| Gender | |||
| Female | 11 (52.4%) | 13 (40.6%) | 
χ2= 0.707, d.f.=1  p= 0.4a  | 
| Male | 10 (47.6%) | 19 (59.4) | |
| Mean age ± SD (years) | 4.74 ± 0.85 | 4.49 ± 0.78 | p= 0.753b | 
| dmft | 0 | 13.16 ± 3.39 | 
Notes.
P of Chi-square test.
t-test was adopted to evaluate the association between the age with the caries status.
- CF
 - caries-free
 - ECC
 - early childhood caries
 - dmft
 - decayed-missing-filled deciduous teeth