Primary and secondary outcomes of the VEINART study
| Arterial sampling n (%) | Venous sampling n (%) | P value | Effect size (95% CI) | |
| Primary outcome | ||||
| Pain, mean±SD in mm | 40.5±24.9 | 22.6±20.2 | <0.0001 | 17.9 (9.6 to 26.3) |
| Pain, median (IQR 1–3) in mm | 40.0 (21.0 to 59.0) | 18.0 (10.5 to 30.0) | ||
| Secondary outcomes | ||||
| Number of sampling attempts per patient* | 0.07 | |||
| 1 | 44 (80) | 53 (93) | −13 (−25 to 0) | |
| 2 | 9 (16) | 4 (7) | 9 (−3 to 21) | |
| 3 | 2 (4) | 0 (0) | 4 (−3 to 10) | |
| Change of sampling provider | 3 (5) | 3 (5) | 1 | 0 (−9 to 10) |
| Failure of sampling | 2 (4) | 0 (0) | 0.24 | 4 (−3 to 10) |
| Ease felt by the effector and the primary outcome | 0.02 | |||
| Easy | 24 (44) | 40 (69) | −24 (−42 to −7) | |
| Moderately easy | 23 (42) | 16 (28) | 14 (−3 to 31) | |
| Difficult | 6 (11) | 2 (3) | 7 (−3 to 17) | |
| Very difficult | 2 (4) | 0 (0) | 4 (−3 to 10) | |
| Prescriber’s satisfaction | 0.25 | |||
| Very satisfied | 33 (60) | 43 (74) | −14 (−31 to 3) | |
| Satisfied | 19 (35) | 13 (22) | 12 (−5 to 28) | |
| Partly satisfied | 3 (5) | 2 (3) | 2 (−7 to 11) | |
| Not at all satisfied | 0 (0) | 0 (0) | 0 (−5 to 5) | |
*One missing data in the venous group.