Table 2.
Demographic characteristics of 307 patients.
| Variables | N | Mean ± SD/(%) | Range |
|---|---|---|---|
| Age (years) | |||
| Enrollment age | 307 | 22.68 ± 6.50 | (12, 54) |
| KC onset age | 307 | 20.98 ± 6.06 | (12, 46) |
| Myopia onset age | 221# | 13.97 ± 3.68 | (6, 35) |
| Enrollment age (years) | |||
| < 20 | 115 | 37.46 | – |
| 20–29 | 152 | 49.51 | – |
| ≥ 30 | 40 | 13.03 | – |
| Sex | |||
| Male | 223 | 72.64 | – |
| Female | 84 | 27.36 | – |
| Educational level | |||
| < High school | 52 | 16.94 | – |
| High school | 102 | 33.22 | – |
| > High school | 163 | 49.84 | – |
| Residence | |||
| Urban | 145 | 47.23 | – |
| Rural | 162 | 52.77 | – |
| Onset condition | |||
| Preparing for/replacing glasses | 125 | 40.72 | – |
| Examination before refractive surgery | 17 | 5.54 | – |
| Physical examination | 14 | 4.56 | – |
| Direct hospital visit | 126 | 41.04 | – |
| Other | 25 | 8.14 | – |
| Vision correction before diagnosis | |||
| None | 92 | 29.97 | – |
| Stealth/mostly stealth | 12 | 3.91 | – |
| Glasses/mostly glasses | 203 | 66.12 | – |
| Eye rubbing | 210 | 68.40 | – |
| Family history of KC | 5* | 3.52 | - |
| Allergic disease history | 39 | 12.70 | – |
#A total of 221 KC patients had a history of myopia before diagnosis.
*Family members of 142 KC patients were examined.