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. 2021 Dec 7;27:656–665.

Table 3. Distribution of control and KC with and without progression groups according to gender, age, and presence of atopy.

Variety
 Control
 KCd
 p value
Without progression With progression
Gender
Male
 7
 12
 6
 0.424a
Female
 11
 8
 4
Total
 18
 20
 10
Age (years)
Mean ± SDc
 16.2±3.2
 14.6±2.1
 13.9±1.4
 0.007b
Atopy
Yes
 2
 14
 8
 <0.001a
No
 16
 6
 2
Total 18 20 10

aPearson’s chi-square; bKruskal–Wallis; cStandard deviation; dKeratoconus