highly significantP = 0.000
The PH had a significant positive correlation with LFL and DTI ( r = 0.373, P = 0.039) and a highly significant positive correlation with PL ( r = 0.428, P = 0.000), EX ( r = 0.630, P = 0.000), GP, PW and PANL ( r = 0.556, P = 0.000), but an unexpected, negative, highly significant correlation with NI ( r = − 0.295, P = 0.000), LTI and HGW ( r = − 0.391, P = 0.009).