Table 5. Correlation coefficient analysis between monitoring results and patient demographics.

	Pearson’s r				Spearman’s rho
Period	Age, year	Height, cm	Weight, kg	BMI, kg/m2	Gender	ASA grade	Surgical type
OT (s)	0.078	0.148	0.139	0.092	−0.045	0.384	0.014
NTR (min)	−0.145	−0.012	−0.102	−0.101	0.100	0.205	0.150
SRT (min)	0.105	0.089	0.086	0.051	0.018	0.102	0.022
TT (min)	0.051	0.017	0.031	0.043	−0.026	0.605	0.086

Note:

Pearson’s correlation coefficient was used between two continuous variables while Spearman’s rho was used if one or both variables were categorical. No significant correlation coefficient (P < 0.05) was found in these results.