PMC3749182_01
Timeline of monthly and cumulative participant enrollment and implementation of revised recruitment methodologies for the I-TRIP Study (N = 501).
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Study participants were enrolled over a 27-month period from April 2009 through June 2011, as shown in Figure 1.
I-TRIP study network profile (N = 501) of recruiters and enrolled referrals.. Seeds represent the first row of each image and are presented in the order of enrollment. Seeds offered only paper coupon referrals are shown in the top image; seeds with a choice between paper coupons and electronic referrals are shown in the bottom image.
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pone-0070344-g002
A study network profile of I-TRIP study participants was generated by linking recruiters and their enrolled referrals through their unique identifiers, as presented in Figure 2.