Table 3. Results of the two-sample test for equality of proportions.
| Pain problem (SNOMED ID) | EHR counts (proportion) | Phendo counts (proportion) | Chi-square statistic | 95% CI | z statistic |
|---|---|---|---|---|---|
| Abdominal a (200219) | 1,603 (0.36) | 2,690 (0.38) | 6.14 ( p = 0.01) | −0.04 to 0.004 | −2.47 |
| Abdominal (200219) |
885 (0.20) | 2,690 (0.38) | 433.74 b | −0.20 to 0.17 | −20.82 |
| Headache/Migraines (378253/318736) | 480 (0.05) | 2,644 (0.38) | 1,494 b | −0.33 to 0.31 | −38.65 |
| Backache (134736) | 299 (0.06) | 3,414 (0.49) | 2,198.30 b | −0.43 to 0.41 | −46.88 |
| Chest (77670) | 405 (0.09) | 1,026 (0.14) | 75.93 b | −0.06 to 0.04 | −8.71 |
| Joint (77074) | 334 (0.07) | 733 (0.10) | 27.83 b | −0.04 to 0.02 | −5.27 |
| Dysuria (197684) | 191 (0.04) | 944 (0.13) | 256.33 b | −0.10 to 0.08 | −16.01 |
| Lower limb (4024561) | 261 (0.05) | 1,998 (0.28) | 882 b | −0.24 to 0.21 | −29.69 |
| Upper limb (4009890) | 149 (0.03) | 419 (0.06) | 39.73 b | −0.03 to 0.06 | −6.30 |
| Hip (200219) | 35 (0.003) | 570 (0.08) | 338.49 b | −0.08 to 0.07 | −18.39 |
| Bone (4129418) | 16 (0.03) | 570 (0.08) | 338.49 b | −0.003 to 0.08 | −18.39 |
| Pelvis (4147829) a | 1,312 (0.29) | 3,969 (0.57) | 811.57 b | −0.29 to 0.25 | −28.48 |
Abbreviations: CI, confidence interval; EHR, electronic health record.
Note: 95% confidence interval built around the difference in proportions.
a
Includes the 885 conditions that are mapped under both “abdominal pain” and “pain in pelvis.”
b
p < 0.0001.