TABLE 4.
Agreement in responses on country of birth, phenotype, freckling in childhood, and State of residence in childhood between baseline and follow-up questions, Queensland study of Melanoma: Environmental and Genetics Associations (Q-MEGA), Queensland, Australia, 1987–2005
| Number of categories used for the assessment of repeatability | QFMP* (n=1,380) | Children (n=46) | Adolescents (n=142) | Men over 50 years old (n=71) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
| |||||||||||||
| %Exact Agreement | % GD† | Kappa | % Exact Agreement | % GD† | Kappa | %Exact Agreement | % GD† | Kappa | %Exact Agreement | % GD† | Kappa | ||
| Country of birth‡ | 4 | 100 | NA* | 1.0 | NA* | NA* | NA* | 98.6 | 0.0 | 0.80 | 100.0 | NA* | 1.00 |
| Skin color§ | 3 | 77.5 | 1.4 | 0.43 | NA* | NA* | NA* | 80.9 | 0.0 | 0.39 | NA* | NA* | NA* |
| Hair color§ | 6 (QFMP*) 4 (children, adolescents, men) |
69.7 | 0.0 | 0.60 | 73.3 | 0.0 | 0.58 | 71.1 | 0.7 | 0.44 | 78.6 | 0.0 | 0.76 |
| Eye color§ | 4 (children, adolescents) 3 (men) 3 (QFMP*) |
87.2 | 2.0 | 0.80 | 77.8 | 0.0 | 0.76 | 82.3 | 2.8 | 0.78 | 87.3 | 1.4 | 0.82 |
| Tanning ability of skin§ | 4 | 18.0 | 0.3 | 0.37 | 41.3 | 0.0 | 0.39 | 52.1 | 0.7 | 0.42 | 62.3 | 0.0 | 0.54 |
| Tendency of skin to burn§,¶ | 4 | 45.5 | 0.2 | 0.34 | 47.2 | 0.0 | 0.38 | NA* | NA* | NA* | |||
| Facial Freckling§; ** | 4 | NA* | NA* | NA* | 59.1 | 0.0 | 0.53 | 55.4 | 0.7 | 0.49 | 53.5 | 4.2 | 0.47 |
| Arm Freckling§, ** | 4 | NA* | NA* | NA* | 59.1 | 0.0 | 0.53 | 48.2 | 0.7 | 0.43 | 54.3 | 2.9 | 0.35 |
| Shoulder Freckling§, ** | 4 | NA* | NA* | NA* | 52.3 | 2.3 | 0.37 | 41.5 | 1.5 | 0.30 | 42.0 | 2.9 | 0.35 |
| State lived most from ages 5 to 12 years‡ | 2 (children) 6 (adolescents) 3 (men) 7 (QFMP*) |
98.9 | NA* | 0.96 | 97.8 | NA* | 0.66 | 97.9 | NA* | 0.90 | 98.5 | NA* | 0.97 |
QFMP, Queensland Familial Melanoma Project; NA, not applicable.
GD - Gross Disagreement, answered were exact opposite; applicable only for ordinal variables.
Non-ordinal variable; simple Kappa statistic presented.
Ordinal variable; weighted Kappa statistic presented.
For adolescents, responses to baseline question on tendency to burn were rearranged to match the response options in the follow-up questionnaire.
Responses to three separate questions on freckling at the face, arms and shoulders at age five years at baseline were compared separately with responses to one general question at follow-up on childhood freckling.