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. 2013 Sep 25;8(9):e76354. doi: 10.1371/journal.pone.0076354

Table 3. Global rating categorised into 1 = “competent students”, 2 = “borderline students” and 3 = “incompetent students”.

NGT
t0 t1 t2 p1 (Cramer’s ϕ) p2 (Cramer’s ϕ) p3 (Cramer’s ϕ)
BPSL 1 = 45 (97.8) 2 = 1 (2.2) 3 = 0 (0.0) 1 = 13 (56.5) 2 = 10 (43.5) 3 = 0 (0.0) 1 = 19 (82.6) 2 = 3 (13.0) 3 = 1 (4.4) 0.0008 (0.35) 0.0003 (0.60) <0.0001 (0.70)
TRAD 1 = 33 (73.4) 2 = 12 (26.6) 3 = 0 (0.0) 1 = 2 (9.1) 2 = 12 (54.5) 3 = 8 (36.4) 1 = 3 (13.0) 2 = 10 (43.5) 3 = 10 (43.5)
IVC
t0 t1 t2 p1 (Cramer’s ϕ) p2 (Cramer’s ϕ) p3 (Cramer’s ϕ)
BPSL 1 = 41 (89.1) 2 = 5 (10.9) 3 = 0 (0.0) 1 = 11 (47.8) 2 = 10 (43.5) 3 = 2 (8.7) 1 = 5 (21.7) 2 = 18 (78.3) 3 = 0 (0.0) <0.0001 (0.60) 0.0001 (0.63) <0.0001 (0.77)
TRAD 1 = 14 (31.1) 2 = 25 (55.6) 3 = 6 (13.3) 1 = 1 (4.6) 2 = 7 (31.8) 3 = 14 (63.6) 1 = 1 (4.4) 2 = 5 (21.7) 3 = 17 (73.9)

t0 = immediately after teaching, t1 = after 3 months, t2 = after 6 months. Percentages are shown in round brackets. NGT = nasogastral tube insertion, IVC = intravenous cannulation.

BPSL = “best practice” skills lab teaching, TRAD = traditional “see one, do one” teaching.

P-values were calculated using Chi2-test. p1: TRAD(3months and 6months pooled together) vs. BPSL(3months and 6months pooled together), p2: TRAD3months vs. BPSL3months, and p3: TRAD6months vs. BPSL6months. The effect sizes were calculated using Cramer’s phi.