Table 2. Overview of transition time (T₅₀) expressed in minutes.

T50 in minutes		A1.5	A1.25	C1.5	P-value#	Post-hoc (p-value, pairwise)*
						1	2	3
Predialysis	1st	284 [235–346]	274 [213–308]	271 [234–291]
	2nd	294 [230–331]	291 [239–339]]	282 [244–308]]
	3rd	300 [247–335]	307 [256–337]	280 [262–339]
	Median`	290 [251–323]	308 [256–337]	289 [251–320]	0.22
	p-value#	0.33	<0.001	0. 002
Postdialysis	1st	351 [318–399]	380 [322–400]]	408 [348–455]]
	2nd	357 [337–397]	360 326–413]]	405 [352–451]
	3rd	349 [316–401]	376 [327–404]]	415 [364–479]
	Median	353 [323–405]	358 [327–413]	395 [368–462]	<0.001	0.08	<0.001	<0.001
	p-value#	0.42	0.32	0.23
Delta	1st	72 [1–97]	92 [68–124]	121 [86–168]
	2nd	89 [28–118]	75 [43–98]	115 [92–148]
	3rd	53 [19–97]	74 [34–98]	115 [84–150]
	Median	66 [18–102]	83 [43–108]	121 [90–152]	<0.001	0.09	<0.001	<0.001
	p-value#	0.34	0.001	0.15

Note: Data are expressed as median with 25^th and 75^th percentile, sorted by session and in total.

`Median were calculated for predialysis from second and third session.

^#P-values were calculated with Friedman test.

*Post-hoc p-values were calculated with Wilcoxon Signed Rank test as pairwise comparisons and a p-value <0.017 was considered statistically significant based on Bonferroni correction. A1.5 = acetic-acid dialysate with 1.50mmol/l calcium, A1.25 = acetic-acid dialysate with 1.25mmol/l calcium, C1.5 = citric-acid dialysate with 1.50mmol/l calcium. 1 = A1.5 vs. A1.25; 2 = A1.5 vs. C1.5; 3 = A1.25 vs. C1.5.