Table 2.
Frequencies of the study population and chart review results by diagnosis codes and pharmacy records.
| Postpartum migraine headache case ascertainment method | Study population | Sample | |||||
|
|
Overall (N=157,501), n (%) | 2012-2014 (n=72,471), n (%) | 2017-2019 (n=85,030), n (%) | Charts (n=200) | True cases by chart review (n=142), n (%) | Normalized sampling weight |
|
| Diagnosis codes + pharmacy records | 2531 (1.61) | 1261 (1.74) | 1270 (1.49) | 50 | 50 (100) | 0.000321 | |
| Diagnosis codes only | 3038 (1.93) | 1488 (2.05) | 1550 (1.82) | 50 | 44 (88) | 0.000386 | |
| Pharmacy records only | 1131 (0.72) | 393 (0.54) | 738 (0.87) | 50 | 48 (96) | 0.000144 | |
| Neither diagnosis codes nor pharmacy records | 150,801 (95.75) | 69,329 (95.66) | 81,472 (95.82) | 50 | 0 (0) | 0.019149 | |