Table 2.

The correlation analysis between the doses and preoperative parameters

Characteristic	Mean heart dose r, P	Mean lung dose r, P
Age	0.0807, P = 0.43	− 0.0616, P = 0.54
Pre_BMI	0.0162, P = 0.87	− 0.336, P < 0.001*
VC	− 0.330, P < 0.001*	− 0.0395, P = 0.70
TV	− 0.145, P = 0.15	0.0397, P = 0.70
IRV	− 0.168, P = 0.095	− 0.209, P = 0.037*
ERV	− 0.103, P = 0.31	0.141, P = 0.16
PEF	− 0.106, P = 0.29	− 0.110, P = 0.28

Pre_BMI: preoperative body mass index, VC: vital capacity, TV tidal volume, IRV: inspiratory reserve volume, ERV: expiratory reserve volume, PEF peak expiratory flow, r: Pearson's correlation coefficient, * means statistically significant