Table 2.

Bronchoarterial ratio in RB1 ad RB10

Characteristic	Mean ± SD
RB1 generation*
4th	0.86 ± 0.27
5th	0.80 ± 0.20
6th	0.76 ± 0.23
Mean RB1	0.81 ± 0.20
RB10 generation&
4th	0.79 ± 0.15
5th	0.79 ± 0.21
6th	0.76 ± 0.20
Mean RB10¶	0.78 ± 0.17
Mean RB1 and RB10	0.79 ± 0.16

^*P trend =0.0001 by RB1 generation

^&P trend= 0.14 by RB10 generation

^¶P = 0.17 between RB1 and RB10