| Breast CIS | Invasive breast cancer | |||||
---|---|---|---|---|---|---|---|
 | Observed Person-years | Cases No. | Adjusted RR (95% CI) | Observed Person-years | Cases No. | Adjusted RR (95% CI) | P for homogeneityb |
Nausea or vomiting during pregnancy | Â | Â | Â | Â | Â | Â | Â |
Ever experienced | Â | Â | Â | Â | Â | Â | Â |
   No | 108,269 | 124 | Reference | 111,618 | 620 | Reference |  |
   Yes | 224,001 | 270 | 1.05 (0.85 to 1.30) | 230,499 | 1,174 | 0.92 (0.84 to 1.02) | 0.29 |
Number of pregnancies during which participant experienced nausea or vomitinga | Â | Â | Â | Â | Â | Â | Â |
   1 | 73,892 | 84 | 0.92 (0.70 to 1.22) | 75,959 | 380 | 0.91 (0.80 to 1.03) |  |
   2 | 72,819 | 95 | 1.21 (0.91 to 1.61) | 75,015 | 387 | 0.94 (0.82 to 1.07 |  |
   3 | 43,520 | 53 | 0.99 (0.70 to 1.41) | 44,783 | 238 | 0.94 (0.80 to 1.11) |  |
   ≥ 4 | 33,770 | 38 | 1.16 (0.76 to 1.77) | 34,742 | 169 | 0.91 (0.75 to 1.11) |  |
   P trend |  |  | 0.37 |  |  | 0.25 | 0.20 |
Ever needed treatment for nausea or vomiting during pregnancya | Â | Â | Â | Â | Â | Â | Â |
   No | 184,207 | 220 | 1.04 (0.83 to 1.30) | 189,367 | 947 | 0.90 (0.81 to 1.00) | 0.26 |
   Yes, for most recent pregnancy | 19,436 | 24 | 1.09 (0.70 to 1.69) | 20,092 | 114 | 1.07 (0.88 to 1.31) | 0.96 |
   Yes, for other pregnancy(ies) | 20,358 | 26 | 1.14 (0.74 to 1.74) | 21,039 | 113 | 1.01 (0.83 to 1.24) | 0.63 |
Preeclampsia | Â | Â | Â | Â | Â | Â | Â |
Ever diagnosed with preeclampsia | Â | Â | Â | Â | Â | Â | Â |
   No | 304,969 | 361 | Reference | 314,176 | 1673 | Reference |  |
   Yes, during most recent pregnancy | 8,431 | 17 | 1.72 (1.05 to 2.81) | 8,699 | 44 | 0.98 (0.73 to 1.33) | 0.06 |
   Yes, during other pregnancy(ies) | 12,379 | 13 | 0.93 (0.53 to 1.62) | 12,648 | 51 | 0.77 (0.58 to 1.02) | 0.57 |