Table 5.

Systematic (Σ) and random errors (σ) (mm) according to the BV change reproducibility

		Absolute BV changes					Relative BV changes
		<50 ml	<100 ml	<150 ml	<200 ml	Overall	-50%– +50%	-100%– +100%	-100%– +150%	-100%– +200%	Overall
No. of sessions		162	217	245	262	268	126	211	228	239	268
LR	Σ	0.800	0.862	0.848	0.839	0.841	0.810	0.806	0.817	0.840	0.841
	σ	0.471	0.487	0.469	0.464	0.464	0.430	0.464	0.478	0.479	0.464
CC	Σ	2.526	2.637	2.678	2.668	2.674	2.395	2.628	2.666	2.643	2.674
	σ	1.761	1.626	1.604	1.692	1.694	1.799	1.774	1.733	1.694	1.694
AP	Σ	2.307	2.25	2.264	2.289	2.275	2.174	2.251	2.255	2.243	2.275
	σ	1.447	1.389	1.336	1.362	1.367	1.517	1.437	1.413	1.397	1.367

AP, anterior-posterior; BV, bladder volume; CC, cranial-caudal; LR, left-right.