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Table 3 Among individuals who started continuous treatment with medication for attention-deficit/hyperactivity disorder (ADHD): Likelihood for receiving a specific drug treatment comparing individuals with ADHD and coexisting autism spectrum disorder (ASD) to individuals with ADHD without coexisting ASD

From: Medications for attention-deficit/hyperactivity disorder in individuals with or without coexisting autism spectrum disorder: analysis of data from the Swedish prescribed drug register

  ADHD without coexisting ASD ADHD with coexisting ASD Model 1a Model 2b
  Frequency (%) Frequency (%) Odds ratio (95% confidence interval) Odds ratio (95% confidence interval)
All individuals n = 27,668 n = 3821   
 Methylphenidate 25,508 (92.2) 3467 (90.8) 0.84 (0.74-0.94) 0.86 (0.77-0.97)
 Atomoxetine 6553 (23.7) 1003 (26.3) 1.07 (0.99-1.16) 1.06 (0.98-1.15)
 Dexamphetamine 457 (1.7) 87 (2.3) 1.6 (1.3-2.1) 1.7 (1.3-2.1)
 Modafinil 303 (1.1) 60 (1.6) 1.7 (1.2-2.2) 1.6 (1.2-2.2)
 Amphetamine 142 (0.51) 39 (1.0) 1.9 (1.3-2.7) 1.8 (1.3-2.6)
Adults n = 13,305 n = 1622   
 Methylphenidate 12327 (92.1) 1477 (91.06) 0.89 (0.74-1.1) 0.92 (0.77-1.1)
 Atomoxetine 2577 (19.25) 317 (19.54) 0.98 (0.86-1.1) 0.97 (0.85-1.1)
 Dexamphetamine 413 (3.09) 82 (5.06) 1.8 (1.4-2.3) 1.9 (1.5-2.4)
 Modafinil 295 (2.2) 55 (3.39) 2.1 (1.3-3.4) 2.2 (1.3-3.5)
 Amphetamine 80 (0.6) 22 (1.36) 1.6 (1.2-2.1) 1.5 (1.1-2.1)
Adolescents n = 6465 n = 833   
 Methylphenidate 5922 (91.6) 757 (90.9) 0.93 (0.72-1.2) 0.99 (0.76-1.3)
 Atomoxetine 1692 (26.2) 229 (27.5) 1.0 (0.88-1.2) 1.1 (0.87-1.2)
 Dexamphetamine 21 (0.32) 3 (0.36) 0.91 (0.27-3.1) 0.71 (0.2-2.5)
 Modafinil 6 (0.09) 3 (0.36) 3.9 (0.96-15.9) 3.5 (0.78-15.4)
 Amphetamine 36 (0.56) 7 (0.84) 1.4 (0.6-3.06) 1.3 (0.55-2.9)
Children n = 7818 n = 1366   
 Methylphenidate 7259 (92.9) 1233 (90.3) 0.72 (0.59-0.88) 0.73 (0.60-0.90)
 Atomoxetine 2284 (29.2) 457 (33.5) 1.1 (1.0-1.3) 1.1 (1.0-1.3)
 Dexamphetamine 23 (0.29) 2 (0.15) 0.41 (0.10-1.7) 0.40 (0.09-1.7)
 Modafinil 2 (0.03) 2 (0.15) 6.02 (0.85-42.8) 5.47 (0.7739.1)
 Amphetamine 26 (0.33) 10 (0.73) 2.23 (1.07-4.6) 1.77 (0.83-3.8)
  1. Note: An odds ratio above one indicate that individuals with ADHD and coexisting ASD are more likely to receive medication and an odds ratio below one indicate that those individuals are less likely to receive medication. Significant odds ratios are marked as bolded
  2. Dexamphetamine and amphetamine required a separate application to the Swedish Medical Agency during the observation period (2005-2013). Age categories based on age at first ADHD diagnosis (adults, age ≥ 18 years, adolescents, age 13-17 years, children, age ≤ 12 years)
  3. aAdjusted for sex and birth categories in years and year of first ADHD diagnosis
  4. bAdjusted for sex, birth categories in years, year of first ADHD diagnosis, and psychiatric comorbidities before first dispense date