Skip to main content

Table 3 Estimated change in Specific Substance Involvement Scores over 6 months for PLHIV SBIRT intervention participants at lower compared to moderate–high risk at baseline

From: Changes in Specific Substance Involvement Scores among SBIRT recipients in an HIV primary care setting

Substance Effecta Coefficientb 95% BC CIb, c
Lower, upper limit
Tobacco Months—lower 0.38 0.15, 0.65
  Months—M–H − 0.16 − 0.44, 0.13
  Risk category 18.31 16.71, 19.90
  Month by risk − 0.54 − 0.93, − 0.17
  Interceptd 1.57  
Alcohol Months—lower 0.30 0.09, 0.51
  Months—M–H − 1.29 − 1.84, − 0.75
  Risk category 17.44 15.44, 19.37
  Month by risk − 1.59 − 2.19, − 1.00
  Intercept 4.06  
Cannabis Months—lower 0.52 0.17, 1.02
  Months—M–H − 0.40 − 0.84, 0.03
  Risk category 13.68 11.81, 15.69
  Month by risk − 0.92 − 1.60, − 0.36
  Intercept 1.36  
Cocaine Months—lower 0.30 0.06, 0.63
  Months—M–H − 0.52 − 1.01, − 0.01
  Risk category 16.48 14.06, 19.03
  Month by risk − 0.82 − 1.39, − 0.25
  Intercept 1.28  
Amphetamine Months—lower 0.09 − 0.03, 0.21
  Months—M–H − 0.61 − 1.22, − 0.02
  Risk category 15.95 13.56, 18.43
  Month by risk − 0.69 − 1.32, − 0.10
  Intercept 0.75  
Inhalants Months—lower 0.17 0.06, 0.32
  Months—M–H − 0.72 − 1.40, − 0.09
  Risk category 7.23 4.65, 10.16
  Month by risk − 0.89 − 1.58, − 0.24
  Intercept 0.33  
Sedatives Months—lower 0.09 − 0.01, 0.21
  Months—M–H − 1.50 − 2.12, − 0.83
  Risk category 12.19 9.77, 14.96
  Month by risk − 1.58 − 2.21, − 0.92
  Intercept 0.62  
Hallucinogens Months—lower 0.16 0.05, 0.30
  Months—M–H − 1.68 − 3.05, − 0.02
  Risk category 11.49 7.61, 15.86
  Month by risk − 1.84 − 3.22, − 0.18
  Intercept 0.31  
Opioids Months—lower 0.19 0.05, 0.35
  Months—M–H − 1.13 − 1.93, − 0.17
  Risk category 13.68 10.87, 16.53
  Month by risk − 1.31 − 2.13, − 0.36
  Intercept 0.72  
  1. aEffects in each multilevel regression model. Months—lower is simple slope over time for lower risk category; months—M–H is simple slope over time for moderate–high risk category; reference group for risk category at baseline = 0 (lower risk); month by risk is the cross-level interaction (equivalent to the difference between the two simple slopes, with lower risk as the reference category; the display with only two decimals sometimes results in rounding errors in the table)
  2. bThe nonparametric, bootstrapped 95% bias-corrected confidence interval from 5000 repetitions
  3. cThe coefficient is significant if zero is not in the interval
  4. dThe test of the intercept against zero is not a hypothesis test of interest