Table 3.
Correlation Between Forearm Spectrophotometer Readings and Past-Week Measures of Sun Exposure and Protection Among a Subsample of VIRUSCAN Study Participants (n=159), Tampa, FL, 2014–2017
| Forearm spectrophotometer readingsa |
||||||
|---|---|---|---|---|---|---|
| Questionnaire measurement of exposure/protection | low (<=11.55) |
high (>11.55) |
OR | 95% CIb | ||
| n | % | n | % | |||
| Exposure scale | ||||||
| T1 | 45 | 56.2 | 34 | 43.0 | 1.00 | Referent |
| T2 | 22 | 27.5 | 21 | 26.6 | 1.03 | 0.45, 2.32 |
| T3 | 13 | 16.2 | 24 | 30.4 | 2.48 | 1.01, 6.33 |
| P-trendc = 0.06 | ||||||
| Protection scale | ||||||
| T1 | 29 | 36.2 | 30 | 38.0 | 1.00 | Referent |
| T2 | 26 | 32.5 | 26 | 32.9 | 0.97 | 0.42, 2.24 |
| T3 | 25 | 31.2 | 23 | 29.1 | 0.76 | 0.32, 1.75 |
| P-trend = 0.54 | ||||||
| Ratio of exposure/protection scales | ||||||
| T1 | 37 | 46.8 | 23 | 29.1 | 1.00 | Referent |
| T2 | 26 | 32.9 | 24 | 30.4 | 1.14 | 0.49, 2.61 |
| T3 | 16 | 20.3 | 32 | 40.5 | 2.89 | 1.24, 6.95 |
| P-trend = 0.01 | ||||||
a
Forearm spectrophotometer readings were dichotomized based on the median value.
b
Odds ratio and 95% confidence interval were calculated using logistic regression, adjusted for age and gender.
c
The median score/ratio of each group was used to test the trend between score and spectrophotometer readings, using logistic regression adjusted for age and gender.