Application of intraoperative lung-protective ventilation varies in accordance with the knowledge of anaesthesiologists: a single-Centre questionnaire study and a retrospective observational study

Table 4 Comparison of factors associated with tidal volume among patients who underwent surgery under general anaesthesia in 2004 and 2014

	Tidal Volume (2004)		Tidal Volume (2014)
	Beta	p-value	Beta	p-value
Type of surgery: Laparoscopic surgery (vs. non-laparoscopic surgery)	−22.09	0.001	−.6.15	0.319
Posture: Prone position (vs. other than prone position)	11.57	0.145	1.75	0.909
Sex: Female (vs. male)	−22.57	0.003	−29.66	0.001
Age	−0.19	0.203	−0.31	0.052
Weight	2.86	< 0.001	1.98	< 0.001
Ideal body weight	2.36	< 0.001	1.80	0.001
R²	0.477		0.621

In 2004, V_T was associated with laparoscopic surgery as well as sex, height, and weight; in contrast, in 2014, only sex, height, and weight were associated with V_T. Prone position was not associated with V_T
Beta: regression coefficient
R²: coefficient of determination

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