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OBJECTIVE	It was to test the validity and reliability of an online version of the Female Sexual Function Index ( FSFI ) .
METHODS	An online version of the FSFI was compared to the pen and paper traditional version .
METHODS	Physiotherapy students in three cities were randomly allocated to two groups - G-pp/ol ( n = 126 ) and G-ol/pp ( n = 147 ) .
METHODS	G-pp/ol women replied to th FSFI using the traditional pen and paper method , while G-ol/pp women answered an online version of the same questionnaire .
METHODS	Data were collected ageing after 15 days , when G-pp/ol women answered the online version while G-ol/pp women answered on paper .
METHODS	All data were transferred to SPSS software .
METHODS	Demographic differences between the test two groups were determined by Student 's t-test or Fisher exact ( 95 % CI ; p > 0.05 ) .
METHODS	Association and correlation between the responses of G-pp/ol and G-ol/pp were assessed for each sample by the t-test and Pearson 's coefficient .
METHODS	An identical strategy was used for intragroup comparisons .
RESULTS	A total of 273 women participated in the study and 28 ( 10.2 % ) giving up the second collection .
RESULTS	There were no demographic differences between groups .
RESULTS	Fifteen of the 19 FSFI questions were associated and correlated between the two groups in both test and the retest .
RESULTS	The intragroup analysis revealed that all FSFI questions and scores were associated and weakly correlated for the same group during both test and retest .
CONCLUSIONS	The online version of the FSFI showed acceptable validity and reliability when compared to the paper version , and can justify the choice of this modality , especially in studies involving private questions .

