Table 1. TRD and Non-TRD episode characteristics.
| TRD patient characteristics | TRD Episodes | Non-TRD Episodes | p-value |
| N | 3,134 | 44,520 | |
| Number of patients | 3,095 | 37,255 | |
| Female, N (%) | 2,237 (72.3%) | 25,733 (69.3%) | <0.001 |
| 18–35 years, N (%) | 927 (30.0%) | 11,397 (30.6%) | 0.46 |
| 36–50 years, N (%) | 1,320 (42.6%) | 15,087 (40.5%) | 0.02 |
| 51–64 years, N (%) | 848 (27.4%) | 10,771 (28.9%) | 0.07 |
| Median Duration | 891 | 298 | <0.001 |
| Mean Duration | 1,004 | 452 | <0.001 |
| % TRD episodesa | 6.6% | ||
| % TRD prevalenceb (i.e. %TRD episodes, adjusted for duration) | 13.6% | ||
| Number of days to become TRD, mean [median], (quartile range) | 479, [372],(214–640) | NA | |
| % of episodes that took more than 360 days to become TRD | 52% | NA |
a
% TRD episodes are an approximation of TRD incidence.
b
TRD prevalence = TRD episode-days/(TRD episode days+non-TRD episode days)x100, where episode days are calculated as the number of episodes multiplied by mean duration.