TABLE 2.
Incidence of Cancer by Whether Infants Received Phototherapy, by Cancer Site
| Phototherapy (n = 178 017) | No Phototherapy (n = 4 966 832) | Unadjusted Risk Difference (per 100 000) | 95% CI (per 100 000) | P a | |||
|---|---|---|---|---|---|---|---|
| N b | Incidence (per 100 000) | N b | Incidence (per 100 000) | ||||
| All cancer | 58 | 32.6 | 1042 | 21.0 | 11.6 | 3.6 to 20.7 | .002 |
| Leukemia | 16 | 9.0 | 242 | 4.9 | 4.1 | 0.1 to 9.2 | .025 |
| Lymphoid leukemia | 6 | 3.4 | 133 | 2.7 | 0.7 | −1.7 to 4.2 | .49 |
| Myeloid leukemia | 10 | 5.6 | 103 | 2.1 | 3.5 | 0.4 to 7.8 | .006 |
| Brain or nervous system cancer | 7 | 3.9 | 176 | 3.5 | 0.4 | −2.2 to 4.1 | .69 |
| Eye or orbit cancer | 4 | 2.3 | 103 | 2.1 | 0.2 | −1.8 to 3.2 | .79 |
| Kidney cancer | 8 | 4.5 | 82 | 1.7 | 2.8 | 0.1 to 6.7 | .013 |
| Liver cancer | 2 | 1.1 | 81 | 1.6 | −0.5 | −1.9 to 2.0 | 1.0 |
| Soft tissue cancer | 1 | 0.6 | 69 | 1.4 | −0.8 | −1.9 to 1.3 | .52 |
| Other cancer | 26 | 14.6 | 426 | 8.6 | 6.0 | 0.8 to 12.4 | .013 |
a
Fisher’s exact test used.
b
Some subjects had >1 type of cancer.