Table 4. Comparison of process indicators and length of ICU stay between the two groups ($\overline{x}\pm s$).

	Experimental group	Control group	T	P
Total number of treatments received	13.39 ± 5.53	13.55 ± 6.19	−0.108	0.914
Days in ICU	5.4 ± 1.56	5.1 ± 1.62	0.757	0.452
Mean sputum volume drained	103.31 ± 17.55	100.77 ± 14.22	0.625	0.534

Notes.

ICU, intensive care unit