Table 3. Comparison between the ID (age–sex standardised) and non-ID groups of selected nervous system medication subgroups: rates per 100 encounters.
Medication subgroupID groupID group (age–sex standardised)Non-ID group
nPer 100 encounters (95% CI)Per 100 encounters (95% CI)nPer 100 encounters (95% CI)
Anticonvulsantsa 547.8 (4.7 to 11.0)6.0 (3.2 to 8.7)57640.6 (0.6 to 0.6)
Antipsychoticsa 487.0 (4.8 to 9.1)6.1 (3.7 to 8.5)58370.6 (0.6 to 0.6)
Antidepressants304.3 (2.7 to 6.0)3.5 (1.9 to 5.2)36 0543.7 (3.6 to 3.8)
Antianxiety121.7 (0.8 to 2.7)1.6 (0.6 to 2.6)18 8591.9 (1.9 to 2.0)
Sedatives or hypnotics101.4 (0.6 to 2.3)1.3 (0.4 to 2.3)16 2961.7 (1.6 to 1.7)
  • aNon-overlapping 95% confidence intervals, comparing ID group (age–sex standardised) with non-ID group.

  • CI = confidence intervals. ID = intellectual disability.