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Table 1 Baseline characteristics of patients in the pre- and post-intervention periods

From: Improving Emergency Department radiology transportation time: a successful implementation of lean methodology

   Intervention  
Variables   Pre n = 6186 Post n = 4879 P-value
Age Mean (±SD) 41.7 ± 26.2 43.4 ± 25.9 0.001
Gender Female 2803 (45.3%) 2176 (44.6%) 0.45
Guarantor Self-Pay 1220 (19.7%) 1005 (20.6%) 0.49
Private insurance 4866 (78.7%) 3792 (77.7%)
Other 100 (1.6%) 82 (1.7%)
ESI 1 45 (0.7%) 21 (0.4%) <0.0001
2 438 (7.1%) 230 (4.7%)
3 3936 (63.6%) 3411 (69.9%)
4 1704 (27.5%) 1189 (24.4%)
5 63 (1.0%) 28 (0.6%)
RAD category Chest xray 3041 (49.2%) 2212 (45.3%) 0.002
Abdomen xray 164 (2.7%) 128 (2.6%)
Extremities xray 2540 (41.1%) 2168 (44.4%)
Head and Neck xray 60 (1.0%) 58 (1.2%)
Spine xray 381 (6.2%) 313 (6.4%)
Disposition Admitted 1582 (25.6%) 1304 (26.7%) 0.17
Discharged 4604 (74.4%) 3575 (73.3%)
Day of the week Weekday 4380 (70.8%) 3522 (72.2%) 0.11
Weekend 1806 (29.2%) 1357 (27.8%)
Radiographer Shift Day 2924 (47.3%) 2528 (51.8%) <0.0001
Evening 3262 (52.7%) 2351 (48.2%)
ED characteristics (volume per day) Mean (±SD) 133 ± 17 137 ± 17 <0.0001