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Table 2 Unadjusted analyses for associations between blood sodium levels and outcomes

From: Could sodium imbalances predispose to postoperative venous thromboembolism? An analysis of the NSQIP database

   Unadjusted ORs
  Sodium (mEq/L) Sodium (mEq/L)
  < 135 135–145 > 145 < 135 135–145 > 145
  (n = 87,476) (n = 1,010,167) (n = 11,061) (n = 87,476) (n = 1,010,167) (n = 11,061)
Thromboembolism 1577 (1.8) 9705 (1.0) 276 (2.5) 1.89 (1.79–2.00) Reference 2.64 (2.34–2.98)
Mortality 4479 (5.1) 13,972 (1.4) 1014 (9.2) 3.85 (3.72–3.98) Reference 7.20 (6.73–7.69)
Composite morbiditya 14,795 (16.9) 73,563 (7.3) 2442 (22.1) 2.59 (2.54–2.64) Reference 3.61 (3.45–3.78)
 Wound 3908 (4.5) 23,316 (2.3) 439 (4.0) 1.98 (1.91–2.05) Reference 1.75 (1.59–1.93)
 Cardiac 1694 (1.9) 7472 (0.7) 263 (2.4) 2.65 (2.51–2.80) Reference 3.27 (2.89–3.70)
 Respiratory 7772 (8.9) 31,741 (3.1) 1639 (14.8) 3.01 (2.93–3.08) Reference 5.36 (5.08–5.66)
 Urinary 1724 (2.0) 7627 (0.8) 378 (3.4) 2.64 (2.51–2.79) Reference 4.65 (4.19–5.17)
 CNS 655 (0.8) 3938 (0.4) 135 (1.2) 1.93 (1.77–2.10) Reference 3.16 (2.66–3.75)
 Sepsis 5618 (6.4) 25,568 (2.5) 870 (7.9) 2.64 (2.57–2.72) Reference 3.29 (3.06–3.53)
Bleeding 8128 (9.3) 43,090 (4.3) 1036 (9.4) 2.30 (2.24–2.36) Reference 2.32 (2.18–2.48)
Return to operation room 8490 (9.7) 45,091 (4.5) 1004 (9.1) 2.30 (2.25–2.36) Reference 2.14 (2.00–2.28)
Readmission (related)b 2062 (9.0) 16,099 (5.9) 203 (6.7) 1.59 (1.52–1.67) Reference 1.15 (1.00–1.33)
  1. aComposite morbidity considered positive if any of the following are present: wound, cardiac, respiratory, urinary, CNS injury, sepsis or thromboembolism
  2. bSample size: 300,815