Table 4.

Rapid shallow breathing index characteristics between groups (not weaned vs weaned)

	All patients	Not weaned	Weaned	P value
Initial RSBI (range)	107.7 ± 62.2	101.3 ± 60.0 (14–650)	114.5 ± 64.9 (4–310)	.45
Mean RSBI	90.1 ± 55.7	99.3 ± 30.2	78.7 ± 14.2	.007
Final RSBI		123.3 ± 92.5	71.7 ± 31.2	.005
Initial RSBI ≤ 105	23/52 (63.5%)	18/27 (66.7%)	15/2 (60%)	.83
RSBI variabilitya	.44 ± .24	.51 ± .30	.37 ± .12	.02
Δ RSBI change/day		4.40 ± 11.1	−3.40 ± 9.4	.005

RSBI, rapid shallow breathing index.

^aRSBI variability reported as CV.