Table 4.

Sensitivity, specificity and positive/negative predictive values in random forest permutation, including all 838 cases and controls male blood donor’s answers for the sociodemographic and sexual matrix questions

Measures/Permutation	All variables	Without Type of partners variables	Without sexual orientation variables	Without both partner’s type and sexual orientation variables	Without partner’s HIV status
Sensitivity	0.76	0.76	0.69	0.67	0.58
Specificity	0.89	0.89	0.84	0.84	0.94
Positive Predicitive Value	0.85	0.85	0.78	0.78	0.88
Negative Predicitive Value	0.82	0.82	0.77	0.76	0.73