Respiratory and voice outcomes of office-based injection laryngoplasty in patients with unilateral vocal fold paralysis

The Egyptian Journal of Otolaryngology

Table 7 Comparison between pre-injection and post-injection results of spirometry

Spirometric measures	Percentile values	Predicted values	Pre-injection scores	1 week post-injection scores	3 months post-injection scores	Predicted vs pre-injection	Pre–post injection comparisons
						MW	Friedman
FVC in liters	25th	2.99	2.12	2.35	2.45	Z = 1.15	χ2 = 1.55
	50th	3.39	2.9	2.98	3	P = 0.25	P = 0.45
	75th	4.39	4.1	4.38	4.9
						MW	Friedman
FEV in liters	25th	2.6	1.79	1.85	2.13	Z = 1.19	χ2 = 0.89
	50th	2.99	2.61	2.46	2.42	P = 0.23	P = 0.64
	75th	3.67	3.66	3.67	3.78
						MW	Friedman
PEF in liters/second	25th	6.3	3.3	3.85	3.5500	Z = 2.6	χ2 = 0.67
	50th	6.6	4.27	4.95	4.2400	P = 0.009*	P = 0.7
	75th	7.6	5.87	5.745	5.7500
FEV/FVC in %	Mean	80.9	85.3	81.6	83.1	T = 1.4^a	F = 0.26^a
FEV/FVC in %	SD	2.5	8.9	10.3	11.8	P = 0.18	P = 0.7
FEV/PEF	Mean	0.43	0.59	0.59	0.63	T = 3.4^a	F = 0.3^a
FEV/PEF	SD	0.07	0.12	0.15	0.3	P = 0.004*	P = 0.6

Friedman test was used for non-parametric data
^aOne-way ANOVA test for normally distributed data
^bIndependent t test for normally distributed data, MW Mann-Whitney test non-parametric data, χ2 Pearson’s chi-square