Drugs and drugs interactions from ATC classes A and B with a significant risk of 30-day hospital readmission (controlled for variables in the baseline model: table 4) (N=13 802)
| Variables | OR* | P value >z | 95% CI |
| First level, anatomical main group | |||
| Blood and blood-forming organ drugs (B) | 1.089 | 0.040 | 1.004 to 1.182 |
| Systemic hormonal preparations, excluding sex hormones and insulins (H) | 1.210 | 0.007 | 1.054 to 1.390 |
| Respiratory system drugs (R) | 1.149 | 0.003 | 1.049 to 1.258 |
| Second level, therapeutic subgroup | |||
| Antiemetics and antinauseants (A04) | 3.222 | 0.000 | 1.844 to 5.630 |
| Drugs for functional gastrointestinal disorders (A03) | 1.428 | 0.000 | 1.169 to 1744 |
| Beta-blocking agents (C07) and drugs for acid-related disorders (A02) | 1.367 | 0.022 | 1.046 to 1.788 |
| Drugs for constipation (A06) | 1.199 | 0.017 | 1.033 to 1.392 |
| Agents acting on the renin–angiotensin system (C09) | 0.892 | 0.049 | 0.796 to 0.999 |
| Lipid-modifying agents (C10) | 0.838 | 0.013 | 0.729 to 0.964 |
*Adjusted OR.
ATC, Anatomical Therapeutic Chemical Classification System.