Table 4.

Comparisons of hair density and hair diameter with aging among different scalp sites.

Scalp area	Ethnicity				Pairwise comparison
	Asian (present study)	Caucasian	African	Hispanic	Asian vs. Caucasian	Asian vs. African	Asian vs. Hispanic
Frontal	154.3 ± 12.8	230 ± 33	160 ± 27	174 ± 32	P < 0.01∗	P=0.39	P < 0.01∗
Vertex	162.9 ± 15.7	226 ± 20	149 ± 23	178 ± 33	P < 0.01∗	P < 0.01∗	P < 0.01∗
Occipital	160.2 ± 15.3	214 ± 28	148 ± 25	169 ± 31	P < 0.01∗	P < 0.01∗	P < 0.01∗

Data are mean ± SD. ^∗Statistically significant difference.