Table 4.
Prevalence Ratios for ADHD Between Those Meeting Criteria for CAH and the non-CAH Group in the Commercial and Medicaid Calculated Separately by Sex and Stratified Across Age
| Strata | Met Criteria for ADHD | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Boys | Girls | |||||||||
| n (%) | PRa | 95% CI | P Value | n (%) | PRa | 95% CI | P Value | |||
| Commercial sample | ||||||||||
| Non-CAH group (reference) | All | 209 426 (11.3) | 1 | 99 876 (5.5) | 1 | |||||
| CAH group | 16 (9.6) | 0.94 | (0.59-1.49) | 0.496 | 19 (9.2) | 1.71 | (1.11-2.62) | 0.018 | ||
| Non-CAH group (reference) | 5-11 y | 103 412 (11.7) | 1 | 42 695 (5.1) | 1 | |||||
| CAH group | 5 (6.1) | 0.52 | (0.22-1.22) | 0.116 | 9 (10.0) | 1.98 | (1.07-3.7) | 0.032 | ||
| Non-CAH group (reference) | 12-18 y | 106 014 (11.0) | 1 | 57 181 (5.8) | 1 | |||||
| CAH group | 11 (13.1) | 1.20 | (0.69-2.07) | 0.530 | 10 (8.6) | 1.49 | (0.82-2.69) | 0.194 | ||
| Medicaid sample | ||||||||||
| Non-CAH group (reference) | All | 355 166 (20.5) | 1 | 164 754 (9.7) | 1 | |||||
| CAH group | 18 (18.0) | 0.87 | (0.57-1.32) | 0.507 | 16 (10.9) | 1.12 | (0.70-1.78) | 0.626 | ||
| Non-CAH group (reference) | 5-11 y | 225 972 (22.4) | 1 | 99 783 (10.4) | 1 | |||||
| CAH group | 13 (21.0) | 0.94 | (0.58-1.52) | 0.442 | 11 (12.9) | 1.24 | (0.72-2.16) | 0.446 | ||
| Non-CAH group (reference) | 12-18 y | 129 194 (17.9) | 1 | 64 971 (8.7) | 1 | |||||
| CAH group | 5 (13.2) | 0.73 | (0.32-1.66) | 0.463 | 5 (8.1) | 0.93 | (0.40-2.15) | 0.858 | ||
P values represent χ 2 tests.
aPRs presented for the main effect of CAH in each subsample have been adjusted after stratification by age. PRs for each stratum (5-11 years and 12-18 years) are unadjusted.
Abbreviations: ADHD, attention-deficit/hyperactivity disorder; CI, confidence interval; PR, prevalence ratio.