The impact of preoperative biliary drainage on postoperative outcomes in patients with malignant obstructive jaundice: a retrospective analysis of 290 consecutive cases at a single medical center

Table 4 A comparison of laboratory testing results at two time points (initial diagnosis and perioperative testing) between the two groups

Characteristics	DG		PG		Initial data compared between groups		Perioperative data compared between groups
Characteristics	Initial	Perioperative	Initial	Perioperative	Statistic	P value	Statistic	P value
Hb (g/L)	125.85 ± 14.41	123.11 ± 14.74	121.17 ± 17.58	115.35 ± 15.93	t = 2.441	0.015	t = 4.193	< 0.001
WBC (10⁹/L)	6.11 ± 1.82	6.00 ± 1.76	6.55 ± 2.26	6.37 ± 2.04	t = −1.754	0.081	t = −1.670	0.096
NEUT (%)	63.15 ± 9.44	64.16 ± 9.31	67.11 ± 9.40	61.9 ± 9.51	t = −3.504	0.001	t = 1.972	0.050
Plt (10⁹/L)	250.5 ± 82.90	255.24 ± 85.44	255.6 ± 88.94	248.31 ± 84.76	t = −0.494	0.662	t = 0.679	0.498
ALB (g/L)	38.57 ± 4.16	38.21 ± 4.06	37.42 ± 4.96	40.75 ± 5.23	t = 2.085	0.038	t = −4.552	< 0.001
ALT (U/L)	198.78 ± 153.36	165.80 ± 140.32	166.10 ± 150.58	79.19 ± 62.58	t = 1.799	0.073	t = 6.340	< 0.001
AST (U/L)	134.50 ± 99.18	115.38 ± 93.63	131.63 ± 121.91	55.24 ± 44.08	t = 0.140	0.889	t = 6.530	< 0.001
TB (μmol/L)	140.84 ± 82.94	158.12 ± 95.11	225.1 ± 126.27	81.76 ± 56.74	t = −6.695	<0.001	t = 7.837	< 0.001
DB (μmol/L)	115.70 ± 69.55	132.52 ± 79.48	184.20 ± 102.96	70.36 ± 48.47	t = −6.601	<0.001	t = 7.598	< 0.001
GGT (U/L)	812.81 ± 627.21	736.18 ± 592.00	582.53 ± 434.59	224.00 ± 178.62	t = 3.501	0.001	t = 9.160	< 0.001
ALP (U/L)	430.06 ± 265.00	423.75 ± 262.36	465.36 ± 362.82	230.09 ± 157.57	t = −0.936	0.350	t = 7.195	< 0.001
Na (mmol/L)	139.74 ± 3.03	139.75 ± 3.15	138.88 ± 3.18	139.87 ± 2.96	t = 2.303	0.022	t = −0.327	0.728
PT (s)	11.53 ± 2.12	11.16 ± 1.21	11.569 ± 1.50	11.69 ± 1.09	t = −0.171	0.864	t = −3.824	< 0.001

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