Table 3 Results of the second phase (retention of skills, after 6 months)

Number, n

75

60

First evaluation

Time, s ± SD

55.6 ± 29.9^†*

43.1 ± 34.7^†*

Number of attempts, n, mean ± SD

2.0 ± 1.5

2.0 ± 1.3

Tidal volume ≤ 150 ml, n (%)

11 (14.7)

10 (16.4)

Tidal volume (ml), mean ± SD

556 ± 160^†*

902 ± 389^†

No Leakage, n (%)

59 (78.7)

45 (73.8)

Impossible placement, n (%)

2 (3.4)

2 (3.8)

Second evaluation

Time, s ± SD

23.5 ± 13.2*

26.6 ± 21.6*

Number of attempts, n, mean ± SD

1.1 ± 0.5

1.4 ± 0.9

Tidal volume ≤ 150 ml, n (%)

10 (13.3)

6 (9.8)

Tidal volume (ml), mean ± SD

765 ± 267^†*

930 ± 290^†

No Leakage, n (%)

64 (85.3)

53 (86.9)

Impossible placement, n (%)

2 (3.4)

2 (3.8)