Table 11 Comparison between chronological age and estimated age by EGY III (lower jaw) in group I (n = 1000) at different class intervals

Mean ± SD

Mean ± SD

Mean ± SD

149

6.43 ± 0.22

6.98 ± 0.87

0.55 ± 0.82

8.277^*

 < 0.001^*

145

7.45 ± 0.24

8.39 ± 0.82

0.94 ± 0.78

14.434^*

 < 0.001^*

219

8.47 ± 0.26

8.77 ± 0.62

0.30 ± 0.61

7.256^*

 < 0.001^*

106

9.60 ± 0.33

9.50 ± 0.89

-0.10 ± 0.94

1.084

0.281

258

10.48 ± 0.26

9.89 ± 0.87

-0.60 ± 0.91

10.581^*

 < 0.001^*

87

11.45 ± 0.26

10.58 ± 0.99

-0.87 ± 0.90

9.032^*

 < 0.001^*

36

12.42 ± 0.25

11.22 ± 0.45

-1.21 ± 0.55

13.177^*

 < 0.001^*