Results
The study included 1545 patients between July 2011 and July 2012. Ages of patients were between 1 and 90 years, with a mean of 42.39±20.01; 48,7% of the subjects were female (n=753) and 51,3% were male (n=792).
There were no differences in age distribution in terms of gender when eyebrow and eyelash whitening were taken as a whole (p>0.05). When the age distribution of all subjects was investigated, mean age was significantly lower in females when compared with males (p<0.05) (Table 1).
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There was no whitening in the right eyebrow in 87.2% (n=1347) and left eyebrow in 87.6% (n=1354) of the subjects. When whitening in the right eyebrow was evaluated, 4.4% (n=68) had level 1, 5.3% (n=82) had level 2, 2.3% (n=35) had level 3, and 0.8% (n=13) had level 4 whitening. For the left eyebrow, 4% (n=62) had level 1, 5.2% (n=81) had level 2, 2.3% (n=35) had level 3, and 0.8% (n=13) had level 4 whitening (Table 1).
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While there was no whitening in the right eyelash in 97.7% (n=1509) and left eyelash in 97.9% (n=1512) of the subjects, the most common whitening was level 1 (1.8%, n=28) and there was no level 4 whitening in any subject in right or left eyelashes. Of those with right eyelash whitening, 1.8% (n=28) had level 1, 0.3% (n=4) had level 2, and 0.3% had level 3 (n=4) whitening. For the left eyelash, 1.6% (n=25) had level 1, 0.3% (n=4) had level 2, and 0.3% had level 3 (n=4) whitening (Table 2).
When the relationship between gender and whitening was evaluated, absence of whitening in either right or left eyelashes was significantly more common in females (p<0.01). Rate of level 1, 2, 3, and 4 right or left eyebrow whitening was significantly higher in males compared to women (p<0.01) (Table 3).
There were no differences in terms of gender for levels of right and left eyelash whitening (p>0.05) (Table 2).
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When the association between age and whitening was investigated, there was no right or left eyebrow whitening in 1-10, 11-20, 21-30, or 31-40 age groups; whitening began in the 41-50 age group and showed an increase in frequency in each subsequent age group. When means of age were evaluated, mean age was 39.59±19.63 in subjects with no right eyebrow whitening, 59.04±8.61 years in level 1, 61.20±9.22 years in level 2, 63.49±9.87 years in level 3, and 69.77±6.37 years in level 4 whitening (Table 4).
In the left eyebrow, mean age was 39.70±19.65 in subjects with no whitening, 59.19±8.76 years in level 1, 60.94±9.14 years in level 2, 63.49±9.87 years in level 3, and 69.77±6.37 years in level 4 whitening. Age distribution was significantly different in terms of left vs. right eyebrow whitening levels (p<0.01); further analysis showed that the group with no whitening was significantly younger than the groups with level 1, 2, 3 and 4 whitening (p<0.01). There were no age differences between subjects with right or left level 1, 2, 3, and 4 eyebrow whitening (p>0.05) (Table 4).
There was no whitening in right or left eyelashes in 1-10, 11-20, 21-30, and 31-40 years age groups; whitening began in the 41-50 years age group and showed an increase in frequency in each subsequent age group. Mean age of subjects without any right eyelash whitening was 41.85±19.87 years and 63.57±10.75 years in those with whitening. Mean age of subjects without any left eyelash whitening was 41.91±19.87 years and 63.64±10.34 years in those with whitening. There was a significant difference in age distribution in terms of right or left eyelash whitening (p<0.01) (Table 5).
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