Novel flangeless video laryngoscope for limited mouth opening

Table 1 Visualization quality and intubation time for the different laryngoscopes, mean ± SD

Observer	Macintosh				Traditional				Flangeless
	A	TOI	POGO	CL	A	TOI	POGO	CL	A	TOI	POGO	CL
1	1	10.47	60	2	1	14.19	70	2	1	4.58	80	1
2	1	11.98	50	2	1	15.12	90	1	1	11.80	80	2
3	1	9.87	60	2	3	19.93	50	2	1	15.80	90	1
4	1	10.11	70	1	1	9.53	100	1	1	11.10	90	1
5	1	10.45	40	1	1	8.76	90	1	1	17.12	90	1
6	1	7.92	50	2	1	8.87	40	1	1	17.19	90	1
7	1	18.51	60	1	2	38.91	100	1	1	5.15	90	1
8	1	8.79	60	1	1	15.36	80	2	1	12.23	90	1
9	1	4.54	40	1	2	27.30	90	1	1	8.95	100	1
10	1	8.80	50	2	1	10.20	80	2	1	2.64	90	1
Central tendency (IQR)	1 (1, 1)	10.14 ± 3.55	54.00 ± 9.66	2 (1, 2)	1 (1, 2)	16.82 ± 9.69	79.00 ± 20.20	2 (1, 2)	1 (1, 1)	10.66 ± 5.26	89.00 ± 5.68	1 (1, 1)
95%CI		7.60-12.70	47.09-60.91	1.12-1.88	0.90-1.90	9.89-23.75	64.52-93.48	1.03-1.77	1.00-1.00	6.89-14.42	84.94-93.06	1.00-1.00

Friedman test (multiple related samples) for attempts: χ² = 6.000; P = 0.050. Between group differences (Wilcoxon signed rank test): Macintosh vs traditional: Z = 1.633; P = 0.102; Macintosh vs flangeless: Z = 0; P = 1.000; Traditional vs flangeless: Z = 1.633; P = 0.102. Analysis of variance (repeat measures) for time of intubation: F = 117.14; P < 0.001. Between group differences (paired t-test): Macintosh vs traditional: t = 2.459; P = 0.036; Macintosh vs flangeless: t = 0.230; P = 0.823; Traditional vs flangeless: t = 1.548; P = 0.156. Analysis of variance (repeat measures) for percentage of glottic opening: F = 931.84; P < 0.001. Between group differences (paired t-test): Macintosh vs traditional: t = 3.555; P = 0.006; Macintosh vs flangeless: t = 8.720; P < 0.001; Traditional vs flangeless: t = 1.539; P = 0.158. Friedman test (multiple related samples) for Cormack-Lehane: χ² = 6.000; P = 0.050. Between group differences (Wilcoxon signed rank test): Macintosh vs traditional: Z = 0.577; P = 0.564; Macintosh vs flangeless: Z = 2.000; P = 0.046; Traditional vs flangeless: Z = 1.342; P = 0.180. IQR: Interquartile range; TOI: Time of intubation; A: Attempts; POGO: Percentage of glottic opening; CL: Cormack-Lehane.