Table 1

Response rates

n

%


Overall baseline sample

88

(100)


Baseline only

74

(84)



Overall follow-up sample

31

(100)


Follow-up only

17

(55)



Baseline and follow-up

14

(16)


Knittel et al. Harm Reduction Journal 2010 7:8   doi:10.1186/1477-7517-7-8

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