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Table 4 Effect modification of the association between age and sharing of injection drug equipment

From: Age and sharing of needle injection equipment in a cohort of Massachusetts injection drug users: an observational study

Age, yrs (n) % Share OR (95% CI) Age, yrs (n) % Share OR (95% CI) p-value for interaction term
PTSD Symptoms Score ≤50 (n = 213) PTSD Symptoms Score >50 (n = 270)  
<25: n = 42 59.5% 4.07 (1.89, 8.77) <25: n = 59 45.5% 1.29 (0.69, 2.39) 0.09
≥25: n = 171 30.4% ref ≥25: n = 211 44.6% ref
No History of Money for Sex (n = 332) History of Money for Sex (n = 119)  
<25: n = 74 55.4% 2.67 (1.52, 4.66) <25: n = 26 42.3% 0.89 (0.34, 2.34) 0.05
≥25: n = 258 34.5% ref ≥25: n = 93 48.4% ref
Born in US (n = 427) Born outside US (n = 57)  
<25: n = 95 53.7% 2.37 (1.46, 3.86) <25: n = 51 16.7% 0.15 (0.01, 1.99) <0.01
≥25: n = 332 34.6% ref ≥25: n = 6 60.8% ref  
  1. N=33 missing information on receipt of money for sex.
  2. Models are adjusted for frequency of cocaine injection, frequency of injection drug use, and (except for model of effect modification by US born) whether US born.
  3. Sharing is defined as any sharing of injection drug equipment in the past 30 days.
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