Table 7.

Reference values of the Bifrontal Index for Group I.

Age group	10	25	50	75	90	10–90 norm	Mean ±SD
0–12 months	0.274	0.294	0.310	0.339	0.380	0.274–0.380	0.318±0.043
>12–36 months	0.268	0.294	0.319	0.330	0.345	0.268–0.345	0.316±0.058
>3–6 years	0.276	0.290	0.310	0.329	0.346	0.276–0.346	0.310±0.027
>6–9 years	0.265	0.284	0.304	0.327	0.343	0.265–0.343	0.305±0.034
>9–12 years	0.279	0.292	0.302	0.327	0.351	0.279–0.351	0.308±0.031
>12–15 years	0.285	0.293	0.306	0.322	0.332	0.285–0.332	0.306±0.024
>15–18 years	0.288	0.295	0.311	0.321	0.336	0.288–0.339	0.310±0.027