Variable | Difference in mean daily UV dose to face for 1 SD change in predictor variable (SED) | 95% CI | P value | |
Lower | Upper | |||
Timeline (how long will XP last?) | −0.036 | −0.042 | −0.028 | 0 |
Photoprotection control: perceived level of control of UV protection over XP | 0.032 | 0.011 | 0.056 | 0.004 |
Abnormal sensitivity to sunburn | −0.058 | −0.096 | −0.015 | 0.008 |
‘Necessity’: perceived importance of UVR protection to health | −0.034 | −0.058 | −0.009 | 0.008 |
Treatment control: perceived level of control of medical treatment over XP | 0.022 | 0.005 | 0.04 | 0.012 |
Satisfaction with social support | 0.023 | 0.002 | 0.044 | 0.028 |
Automaticity: degree to which avoiding going outside is automatic | −0.03 | −0.057 | −0.002 | 0.033 |
Age at diagnosis | 0.03 | 0.002 | 0.059 | 0.036 |
Automaticity: degree to which photoprotection is automatic | −0.033 | −0.064 | 0 | 0.048 |
Illness concern: how concerned about the XP | 0.015 | −0.001 | 0.031 | 0.074 |
Male | −0.052 | −0.104 | 0.005 | 0.075 |
‘Concerns’: perceived damage to health from UVR protection | −0.021 | −0.043 | 0.002 | 0.079 |
Understanding: perception of how well I understand XP | 0.012 | −0.007 | 0.033 | 0.222 |
Consequences of XP on life | −0.024 | −0.063 | 0.016 | 0.241 |
Emotional representation: degree of emotional impact of XP | −0.017 | −0.046 | 0.012 | 0.246 |
Age started photoprotection | 0.016 | −0.013 | 0.047 | 0.275 |
‘Identity’: how much patient experiences symptoms of XP | −0.015 | −0.042 | 0.013 | 0.289 |
Previous mucocutaneous malignancy | 0.03 | −0.028 | 0.093 | 0.311 |
Confidence in ability to avoid going outside over next week | −0.013 | −0.038 | 0.013 | 0.32 |
Ethnicity (white British or non-white British) | 0.024 | −0.026 | 0.076 | 0.355 |
Psychological well-being (SWEMWBS score) | 0.011 | −0.013 | 0.036 | 0.376 |
Level of social support | −0.01 | −0.035 | 0.016 | 0.438 |
Cognitive impairment | 0.024 | −0.065 | 0.123 | 0.602 |
Personal control: perceived level of control over XP | −0.007 | −0.034 | 0.02 | 0.605 |
Confidence in ability to photoprotect when out over next week | 0.005 | −0.02 | 0.03 | 0.704 |
Difference between ‘necessity’ and ‘concerns’ | 0.003 | −0.017 | 0.023 | 0.769 |
Strength of intention to avoid going outside over next week | 0.003 | −0.025 | 0.031 | 0.833 |
Strength of intention to photoprotect when out over next week | −0.002 | −0.022 | 0.02 | 0.887 |
Age | 0.001 | −0.033 | 0.036 | 0.956 |
This is the numerical data represented in figure 1. For clarity, the factors are presented in order of increasing p value, and those which can be seen to have an association with mean daily dose of UVR reaching the face, significant at the 5% level, are highlighted in red.
*Difference between the mean daily dose of UVR reaching the face (SED) for a 1 SD change in the predictor variable for continuous variables and change relative to reference group (eg, ‘males’ vs ‘females’) for categorical variables.
SED, standard erythemal dose; SWEMWBS, short-form Warwick-Edinburgh Mental Well-Being Scale; UVR, ultraviolet radiation; XP, xeroderma pigmentosum.