Hair Ethnicity 210 (Figure 6). As mentioned above, the nature of the problems was also different, as the two most frequently reported problems were breakage and dry scalp, gray and no-body, split ends and dandruff, and split ends and too frizzy for African-Americans, Caucasians, Chinese, and Mexicans, respectively. In light of the information presented in the previous section on hair growth parameters it seems particularly significant to point out that 29% of the African- American women reported that their hair grew too slowly and 9% said it was their biggest problem. This correlates well with the reported slower growth rates for African and African-American hair. Physical Behavior Combing: When manipulating hair during combing and brushing, care must be taken to mitigate damage from breakage. However, the degree of damage can be influenced by the curl type and environmental conditions. It takes more energy and higher forces are needed to comb through curly hair than to comb through Figure 6 Average number of hair problems for four ethnic groups.