Programs to Reduce Teen Pregnancy, Sexually Transmitted Infections, and Associated Sexual Risk Behaviors: A Systematic Review. Programs to Reduce Teen Pregnancy, Sexually Transmitted Infections, and Associated Sexual Risk Behaviors: A Systematic Review : Table 3

06/18/2013

: Table 3

CharacteristicNumber of Studies (Percentage)
Study Design 
Randomized controlled trial77 (87)
Cluster36 (41)
Individual 39 (44)
Mixeda2 (2)
Quasi-experimental design11 (13)
Sample size 
Smallestn = 62
Mediann = 447
Largestn = 5,244
Number of follow-up surveys 
One21 (24)
Two25 (28)
Three24 (27)
Four or more18 (20)
Length of first follow-upb 
Shortest0 months
Median0 months
Longest72 months
Length of last follow upb 
Shortest0 months
Median12 months
Longest180 months
Outcome measuresc 
Sexual activity76 (86)
Sexual initiation/abstinence44 (50)
Recent sexual activity39 (44)
Number of sexual partners43 (49)
Frequency of sexual activity24 (27)
Contraceptive use and/or consistency70 (80)
Sexually transmitted infections (STIs)20 (23)
Pregnancy or birth25 (28)