TABLE 3.

Relevant results of multivariable models (model‐adjusted means, 95% CIs, and P values) testing 2‐way interactions between BPP method of measurement, body weight, operator, and day of measurement, against mean volume of urine recorded

Variable	Mean	Mean 95% CI	P value
Method of measurement × Body weight
Method of measurement			.002*
Child	37.4	25.1‐55.6
Man	40.1	26.9‐59.6
Actual	44.9	30.1‐67.1
Body weight (kg)			.02*
≤5.5	19.6	8.9‐43.4
5.6‐11.94	25.2	11.5‐55.7
11.95‐24.9	110.0	46.1‐262.4
≥25	50.3	25.3‐100.3
Two‐way pairs (setting—kg)			.001*
Child: ≤5.5	17.4	7.8‐38.6
Child: 5.6‐11.94	21.0	9.4‐46.5
Child: 11.95‐24.9	117.1	48.9‐280.4
Child: ≥25	45.7	22.8‐91.4
Man: ≤5.5	17.5	7.9‐38.8
Man: 5.6‐11.94	25.6	11.5‐56.8
Man: 11.95‐24.9	118.4	49.4‐282.6
Man: ≥25	48.8	24.4‐97.7
Actual: ≤ 5.5	24.9	11.1‐55.9
Actual: 5.6‐11.94	29.7	13.3‐66.7
Actual: 11.95‐24.9	95.9	39.6‐232.3
Actual: ≥25	57.2	28.3‐115.5
Operator × Method of measurement			.23
Operator × Day			.64
Operator × Body weight			.46
Method of measurement × Day			.29

Significant contrasts for Method of measurement × Body weight interaction
Weight (kg)	Relevant contrasts	Difference	P value
	Setting × Weight
≤5.50	Actual versus child	7.5	.02*
	Actual versus man	7.4	.02*
≤ 5.50	Child versus man	−0.1	1.00
5.60‐11.94	Actual versus child	8.7	.03*
	Actual versus man	4.1	.92
5.60‐11.94	Child versus man	−4.6	.32
11.95‐24.9	Actual versus child	−21.2	.81
	Actual versus man	−22.5	.71
11.95‐24.9	Child versus man	−1.3	1.00
≥25.0	Actual versus child	11.5	.41
	Actual versus man	8.4	.84
≥25.0	Child versus man	−3.1	.99

Note: Relevant contrasts of method of measurement by body weight (kg) (the significant predictors) are appended.

Abbreviation: BPP, BladderScan Prime Plus; CI, confidence interval.