Table 2.

Statistical comparisons of variables at each transection level

	Level 2	Level 3	Level 4
Ttot	‡	ns	†
Ti	ns	ns	*
PNA Amp	ns	*	ns
IS	*	ns	ns

Symbols indicate statistical comparisions of variables at each transection level with values for the intact preparation. T_tot, respiratory cycle length; T_i, inspiratory duration; PNA Amp, phrenic nerve activity amplitude; IS, irregularity score. P values were calculated using 1-way ANOVA test for multiple comparisons.

^*P < 0.011;

^†P < 0.001;

^‡P < 0.0001; ns, not significant.