Table 1.
Characteristics of the current study population and results of the questionnaire.
| Number of Cases | Mean ± Standard Deviation (Range) | |
|---|---|---|
| Age (years) | 10.6 ± 2.9 (5.0–19.0) | |
| Number of students | 421 | |
| Males | 212 | |
| Females | 209 | |
| Height (cm) | 417 | 144.5 ± 15.6 (110.0–179.0) |
| Weight (kg) | 416 | 40.4 ± 13.9 (16.7–91.2) |
| BMI (kg/m2) | 416 | 18.8 ± 3.6 (12.1–31.9) |
| SE (D) | 421 | −0.44 ± 1.38 (−12.63–7.25) |
| AL (mm) | 416 | 22.98 ± 0.87 (20.16–26.90) |
| Time spent outdoors (min/day) | 123 | 155.9 ± 104.3 (9.3–540.0) |
| Time spent in near work (min/day) | 121 | 516.4 ± 248.3 (60.0–1096.5) |
| Time spent sleeping (min/day) | 113 | 507.8 ± 100.7 (300.0–875.0) |
| Family economic status | ||
| Less than BRL 1000 | 42 | |
| BRL 1000 to 3000 | 19 | |
| BRL 3000 to 5000 | 5 | |
| More than BRL 5000 | 5 | |
| Unknown | 171 | |
| Number of parents with myopia | ||
| 0 | 158 | |
| 1 | 38 | |
| 2 | 6 | |
| Unknown | 219 |
Abbreviations: SE, spherical equivalent; AL, axial length; BMI, body mass index; D, diopter. BRL 1 was equivalent to USD 0.18 on 19 August 2020.