Table 5 Multivariate analysis of the association between factors recorded in birth records and acute lymphoblastic leukemia.*+
From: Parental and infant characteristics and childhood leukemia in Minnesota
| Â | Sub-cohort | Cases | Â | Â |
|---|---|---|---|---|
| Â | No. (%) | No. (%) | HR | 95% CI |
Maternal age (continuous/5 year increase) | 7230 | 481 | 0.97 | 0.88–1.08 |
Maternal Ethnicity | Â | Â | Â | Â |
   black | 280 (4) | 8 (2) | 0.43 | 0.21–0.88 |
   other/unknown | 340 (5) | 21 (4) | 0.95 | 0.59–1.51 |
   white | 6610 (91) | 452 (94) |  | ref. |
Maternal Education | Â | Â | Â | Â |
   high school | 2651 (37) | 160 (33) |  | ref. |
   <high school | 740 (10) | 46 (10) | 1.11 | 0.77–1.58 |
   >high school | 3839 (53) | 275 (57) | 1.18 | 0.95–1.47 |
Last live birth interval | Â | Â | Â | Â |
   no live births | 2915 (40) | 183 (38) |  | ref. |
   <3 years | 2783 (38) | 172 (36) | 1.00 | 0.80–1.25 |
   ≥3 years | 1532 (21) | 126 (26) | 1.36 | 1.05–1.76 |
Child gender | Â | Â | Â | Â |
   female | 3514 (49) | 187 (39) |  | ref. |
   male | 3716 (51) | 294 (61) | 1.43 | 1.18–1.74 |
Birth weight percentile | Â | Â | Â | Â |
   < 5th (< 2495 g) | 320 (4) | 25 (5) | 1.37 | 0.80–2.34 |
   5th-25th (2496–3117 g) | 1436 (20) | 71 (15) |  | ref. |
   26th-50th (3118–3458 g) | 1811 (25) | 105 (22) | 1.17 | 0.85–1.60 |
   51st-75th (3459–3798 g) | 1797 (25) | 130 (27) | 1.37 | 1.00–1.86 |
   76th-95th (3799–4309 g) | 1510 (21) | 115 (24) | 1.40 | 1.02–1.92 |
   ≥95th (≥ 4309 g) | 356 (5) | 35 (7) | 1.71 | 1.11–2.65 |
One minute Apgar score | Â | Â | Â | Â |
   0–7 | 1681 (23) | 138 (29) | 1.30 | 1.05–1.61 |
   >7 | 5549 (77) | 343 (71) |  | ref. |