Table 4.

Respiratory rate at the five times of the study (breaths/min)

			Time
Group	1	2	3	4	5
A1	13.3 ± 1.9	13.2 ± 2.1	13.6 ± 2.6	13.6 ± 2.4	13.4 ± 2.5
A2	13.2 ± 2		13.4 ± 2	13.4 ± 2.4	13.3 ± 1.9
B1	13.7 ± 1.5	13.8 ± 1.8	14 ± 2.3	14 ± 1.8	13.8 ± 2.1
B2	13.4 ± 2		13.4 ± 2.6	13.4 ± 2.4	13.3 ± 2.5
C	18.9 ± 2.4*	18.5 ± 2.2*	18.7 ± 2.3*	18.7 ± 2.8*	18.8 ± 2.1*

*P<0.05, versus all the other groups; no significant difference was found within each group. For explanation of the groups and times, please see text.