Table 1 All data shown as frequencies and percentages. BMI body-mass index, ASA American Society of Anesthesiologists. Missing data is treated as such

Age (years)

2304

.15

  1 to 6

34 (1.5%)

16 (1.4%)

18 (1.5%)

  7 to 12

25 (1.1%)

13 (1.1%)

12 (1.0%)

  13 to 17

43 (1.9%)

28 (2.5%)

15 (1.3%)

  18 to 44

659 (28.6%)

311 (27.4%)

348 (29.7%)

  45 to 64

840 (36.5%)

432 (38.1%)

408 (34.8%)

  ≥ 65

703 (30.5%)

333 (29.4%)

370 (31.6%)

Gender

2279

.43

  Female

1097 (48.1%)

532 (47.3%)

565 (49.0%)

BMI (adults only)

2175

.62

  < 18.5 kg/m²

51 (2.3%)

25 (2.4%)

26 (2.3%)

  18.5 to 24.9 kg/m²

951 (43.7%)

471 (44.4%)

480 (43.1%)

  25 to 29.9 kg/m²

719 (33.1%)

337 (31.7%)

382 (34.3%)

  ≥ 30 kg/m²

454 (20.9%)

229 (21.6%)

225 (20.2%)

ASA Score

2242

.65

  1

600 (26.8%)

303 (27.7%)

297 (25.8%)

  2

1287 (57.4%)

623 (57.0%)

664 (57.8%)

  3

349 (15.6%)

165 (15.1%)

184 (16.0%)

  4

6 (0.3%)

2 (0.2%)

4 (0.3%)

Venous Status

2277

.58

  Good

1583 (69.5%)

778 (69.4%)

805 (69.6%)

  Moderate

568 (24.9%)

286 (25.5%)

282 (24.4%)

  Poor

126 (5.5%)

57 (5.1%)

69 (6.0%)

Catheter Size

2295

.045

  ≤ 16 G

86 (3.7%)

32 (2.8%)

54 (4.6%)

  18 G

1185 (51.6%)

587 (52.1%)

598 (50.5%)

  20 G

951 (41.4%)

478 (42.5%)

473 (40.5%)

  ≥ 22 G

73 (3.2%)

29 (2.6%)

44 (3.8%)

Site of Cannulation

2290

.44

  Back of hand

1814 (79.2%)

905 (80.3%)

909 (78.2%)

  Forearm

339 (14.8%)

153 (13.6%)

186 (16.0%)

  Antecubital fossa

110 (4.8%)

55 (4.9%)

55 (4.7%)

  Other

27 (1.2%)

14 (1.2%)

13 (1.1%)

Operator Function

2275

.88

  Physician

834 (36.7%)

416 (37.1%)

418 (36.2%)

  Registered Nurse

1250 (54.9%)

610 (54.4%)

640 (55.5%)

  Other Specialist

191 (8.4%)

95 (8.5%)

96 (8.3%)

Operator Experience

2166

.31

  < 3 years

486 (22.4%)

248 (23.4%)

238 (21.5%)

  > 3 years

1680 (77.6%)

813 (76.6%)

867 (78.5%)