Table 2 Post-operative 24-h urine chemistry profiles in the 2 groups.

From: 24-hour urine chemistry shows higher stone formation risk after malabsorptive than restrictive type bariatric surgery

 

Restrictive (n = 55)

Malabsorptive (n = 35)

P value

Urine volume, L

1.5 ± 0.8

1.6 ± 0.7

0.540

Creatinine, mmol/L

9.6 ± 4.5

7.9 ± 4.6

0.103

Sodium, mmol/L

126.1 ± 45.0

110.2 ± 40.6

0.094

Potassium, mmol/L

35.9 ± 16.2

27.6 ± 12.3

0.007 *

Calcium, mmol/L

3.4 ± 1.8

2.3 ± 1.4

0.006 *

Magensium, mmol/L

3.3 ± 1.3

2.7 ± 1.4

0.062

Citrate, mmol/L

2.5 ± 1.5

1.3 ± 1.2

< 0.001 *

Phosphate, mmol/L

19.8 ± 8.8

17.2 ± 9.8

0.201

Oxalate, mmol/L

0.29 ± 0.13

0.40 ± 0.23

0.021 *

Urate, mmol/L

2.9 ± 1.4

2.4 ± 1.4

0.083

pH

6.3 ± 0.4

5.9 ± 0.4

< 0.001 *

AP(CaOx)

0.70 ± 0.49

0.66 ± 0.67

0.745

AP(CaP)

236.8 ± 561.5

49.8 ± 117.2

0.020 *

  1. Independent t-test.
  2. AP = ionic streng (the higher, then the higher solubility of the ionic compound).
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