Cohort | n | Teachers Rating ± s.d. | Parents Rating ± s.d. | Decrease in UV215 nm Material ± s.d. | Comment |
After 1 year | 24 | −66.75 ± 12.54 | −73.17 ± 7.48 | −546.78 ± 176.59 | Not normally distributed |
After 5 years | 8 | −72.46 ± 5.59 | −70.42 ± 6.02 | −722.73 ± 312.62 | Normally distributed |