Univariate analysis Multivariate analysis Poisson regression Model 1 Multivariate analysis Poisson regression Model 2 ObGyn triage ED ObGyn triage &ED Incidence Rate Ratio (IRR, 95% CI) Incidence Rate Ratio (IRR, 95% CI) ˚N = 1531 ˚N = 5373 ˚N=1000 P Value ˚N = 7904 P Value ˚N = 7904 P Value ObGyn triage ? ? ? 1§ ? ? ? ED ? ? ? 0.87 (0.83 - 0.9) <0.001¶ ? ? ObGyn triage & ED ? ? ? 1.06 (1.01 - 1.2) 0.01 ? ? Race <0.01* Caucasian 1176 (76.8) 4916 (91.5) 734 (73.4) ? ? ? ? Other 355 (23.2) 457 (8.5) 266 (26.6) ? ? ? ? Age <0.01** ? ? <12.4 3 (0.2) 150 (2.8) 3 (0.3) 1§ ? 1§ ? 12.4 - 51.4 1510 (98.62) 2048 (38.12) 904 (90.4) 1.1 (0.9 - 1.2) 0.1 1.1 (0.9 - 1.2) 0.1¶ ≥51.4 18 (1.18) 3175 (59.08) 93 (9.3) 1.12 (1.007 - 1.2) 0.04¶ 1.11 (1.006 - 1.2) 0.04 Reason for referral Pregnancy ≤ 12 weeks 374 (24.4) 12 (0.22) 0 (0) ? ? 1.2 (1.1 - 1.3) <0.01¶ Pregnancy > 12 weeks 949 (62) 7 (0.13) 0 (0) ? ? 1.11 (1.02 - 1.2) 0.01¶ Vaginal bleeding 82 (5.4) 2 (0.04) 0 (0) ? ? 1 (0.9 - 1.2) 0.5¶ Abdominal pain 59 (3.8) 283 (5.27) 0 (0) ? ? 1§ ? Other 67 (4.4) 5069 (94.34) 0 (0) ? ? 1 (0.9 - 1.1) 0.6¶ Multiple Causes 0 (0) 0 (0) 1000 (100) ? ? 1.2 (1.1 - 1.3) <0.01¶ Time <0.01* Day (8 am to 8 pm) 477 (31.2) 2594 (48.3) 340 (34) 1§ ? 1§ ? Night (8 pm to 8 am) 133 (8.7) 441 (8.2) 76 (7.6) 0.95 (0.89 - 1) 0.08 0.95 (0.89 - 1) 0.08 Day & Night 921 (60.1) 2338 (43.5) 584 (58.4) 1.23 (1.19 - 1.26) <0.001 1.22 (1.19 - 1.26) <0.01 Weekday/Holiday <0.01* Weekday 634 (41.4) 2292 (42.7) 370 (37) 1§ ? 1§ ? Holiday 106 (6.9) 479 (8.9) 72 (7.2) 0.94 (0.88 - 0.99) 0.04¶ 0.94 (0.89 - 0.99) 0.03¶ Weekday & Holyday 791 (51.7) 2602 (48.4) 558 (55.8) 1.23 (1.2 - 1.27) <0.001¶ 1.23 (1.2 - 1.27) <0.01¶ Season <0.01* Winter 188 (12.3) 471(8.8) 51 (5.1) 1§ ? 1§ ? Spring 208 (13.6) 498 (9.3) 51 (5.1) 0.9 (0.9 - 1.1) 0.9 1 (0.9 - 1.1) 0.9 Summer 186 (12.1) 484 (9) 57 (5.7) 1 (0.9 - 1.1) 0.9 1 (0.9 - 1.1) 0.9 Fall 191 (12.5) 432 (8) 58 (5.8) 1 (0.9 - 1.1) 0.9 1 (0.9 - 1.1) 0.9 Multiple seasons 758 (49.5) 3488 (64.9) 783 (78.3) 1.2 (1.1 - 1.3) <0.001 1.24 (1.18 - 1.31) <0.01