Table 3: Relationship Between Age, Gender and Professional (Orthodontist) Assessment of Need According to the Aesthetic Component of the Index of Orthodontic Treatment Need

Variable Professional Assessment of Need (%) χ2 Odd ratio 95%CI p
Need (n=215) No Need (n=397) Lower Upper
Age (years)
12 25 (26.9) 68 (73.1) 3.27 0.64 0.38 1.07 0.07
13 20 (25.0) 60 (75.0) 4.14 0.58 0.33 1.01 0.04*
14 34 (36.6) 59 (63.4) 0.10 1.08 0.66 1.74 0.75
15 32 (42.7) 43 (57.3) 2.13 1.44 0.86 2.42 0.14
16 35 (35.4) 64 (64.6) 0.00 1.10 0.63 1.62 0.96
17 47 (43.5) 61 (56.6) 4.05 1.54 0.99 2.40 0.04*
18 22 (34.4) 42 (65.6) 0.02 0.96 0.54 1.71 0.89
Gender
Male 124 (41.5) 175 (58.5) 10.31 1.73 1.22 2.45 0.00*
Female 91 (29.1) 222 (70.9) 10.31 0.58 0.41 0.82 0.00*

* Significant
Note: The upper limit of the 95% confidence interval for age 13 years and the lower limit of the interval for age 17 years are approximately equal 1(i.e. as if the odds ratios did not cross 1). That is why the corresponding p-values appeared to be significant.

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