This study included 728 patients (78% men) with a median age of 47 years (IQR: 40-53.5 years) who started drinking alcohol at 16 years (IQR: 16–18 years). Among them, the median alcohol consumption was 160 g/day (IQR: 115–240 g/day). Moreover, 92.5% of the patients were or had been smokers and 14.4%.
Table 1 shows the sociodemographic, alcohol use characteristics and blood parameters of patients at admission.
Table 1
Characteristics of 728 patients admitted for detoxification with and without Metabolic Syndrome
| N = 728 n (%) | No MetS N = 627 n (%) | MetS N = 101 n (%) | p value |
Sociodemographic | | | | |
Women | 160 (22.0) | 137 (21.8) | 23 (22.8) | 0.835 |
Age at admission, median (IQR) | 47 [40-53.5] | 46 [40–53] | 51 [45–55] | < 0.001 |
Alcohol consumption | | | | |
Age at starting alcohol use, median (IQR) (n = 673) | 16 [16–18] | 16 [16–18] | 16 [16–20] | 0.223 |
Antecedent of alcohol treatment (n = 673) | 490 (72.8) | 422 (72.9) | 68 (72.3) | 0.912 |
Amount of alcohol consumption (g/day), median (IQR) (n = 678) | 160 [115–240] | 160 [110–240] | 180 [120–250] | 0.113 |
Hematology | median (IQR) | median (IQR) | median (IQR) | |
Hemoglobin (g/dL) (n = 726) | 14.3 [13.2–15.4] | 14.3 [13.2–15.4] | 14.5 [13.3–15.6] | 0.430 |
ESR (s) (n = 687) | 8 [4–18] | 8 [4–17] | 10 [6–24] | 0.001 |
MCV (fl)(n = 717) | 96 [92.1-100.4] | 96 [101 − 92.2] | 95 [92–100] | 0.238 |
Fibrinogen (g/L) (n = 689) | 3.1 [2.6–3.9] | 3.1 [2.5–3.8] | 3.4 [2.7–4.2] | 0.013 |
Serum folate (ng/mL) (n = 606) | 5.1 [3.4–7.7] | 5.1 [3.4–7.6] | 6.0 [3.1–9.5] | 0.249 |
Biochemistry parameters | | | | |
Urate (mg/dL) | 5.2 [4.3–6.3] | 5.1 [4.2–6.1] | 5.9 [5-7.3] | < 0.001 |
Protein (g/L) (n = 727) | 67 [63–72] | 67 [63–72] | 68 [64–72] | 0.464 |
Albumin (g/L) (n = 718) | 39.9 [36.8–42.3] | 39.8 [36.7–42] | 40 [37.8–43.4] | 0.205 |
Creatinine (mg/dL) (n = 718) | 0.79 [0.68–0.92] | 0.79 [0.68–0.9] | 0.83 [0.69–0.97] | 0.021 |
Total bilirubin (mg/dL) (n = 718) | 0.70 [0.49–1.11] | 0.7 [0.5–1.1] | 0.6 [0.5-1.0] | 0.346 |
eGFR (mL/min) (n = 724) | 105.5 [90.4-123.3] | 106.4 [91.7-123.7] | 94.8 [82.3-118.8] | 0.001 |
AST (U/L) | 38 [22-72.3] | 27.8 [21.6–74] | 41 [24–70] | 0.678 |
ALT (U/L) (n = 724) | 32 [18-55.5] | 31 [17.4–54] | 36 [23–61] | 0.017 |
AST/ALT (n = 724) | 1.2 [0.9–1.7] | 1.2 [0.9–1.7] | 1 [0.7–1.5] | < 0.001 |
GGT (U/L) (n = 720) | 120.8 [49.9-325.5] | 116 [43.8–317] | 134.4 [75–435] | 0.027 |
ESR: erythrocyte sedimentation rate; MCV: mean corpuscular volume; eGFR: estimated glomerular filtration rate; AST: aspartate aminotransferase, ALT: alanine aminotransferase; GGT: gamma-glutamyl transferase |
Regarding pre-existing medical co-morbidity, 26.7%, 9.2%, and 6.8% of the patients had a history of hypertension, type 2 diabetes, and CVD, respectively. Overall, the median BMI at admission was 25.0 Kg/m2 (IQR: 22.1–28.7 kg/m2)
Prevalence of hypertriglyceridemia, hyperglycemia and low HDL cholesterol was 33.2%, 27.1% and 20.1%, respectively.
Prevalence and Characteristics of MetS patients
The prevalence of MetS was 13.9% (101/728) with no differences between men and women. Among the patients with MetS, 27.7% had a history of type 2 diabetes, and 78.2% showed elevated fasting glucose levels at admission. Furthermore, 86.9% of MetS patients had obesity, 70.3% had hypertension, 15.3% had a history of CVD, 80.2% had high triglycerides, and 67.3% had low HDL cholesterol (50% in men and 66.7% in women). The prevalence of atherogenic dyslipidemia among those with MetS was 70.2%.
Associations of MetS
MetS patients were older (51 years vs. 46 years, p < 0.001) as compared to those without MetS (Table 1).
Figure 1 shows the prevalence of MetS according to sex and age groups (< 40 years, 40–44 years, 45–49 years, 50–54 years, 55–59 years, and ≥ 60 years). The prevalence of MetS increased in each age group up to the 50–54 years age group and decreased in those older than 55 years.
MetS patients had higher values of ESR (p = 0.001) and fibrinogen (p = 0.013), as well as a higher prevalence of hyperuricemia (31.7% vs. 12.1%, p < 0.001), GGT > 50 U/L (90.1% vs. 71.9%, p < 0.001) and serum creatinine > 0.90 mg/dL (37.6% vs. 24.6%, p = 0.006) as compared to those without MetS. There was an association between eGFR and MetS in univariate analysis: prevalence of MetS was 11.0%, 20.6%, and 50.0% for eGFR > 90 mL/min, eGFR between 60–90 mL/min, and eGFR < 60 mL/min, respectively (p < 0.001). Figure 2 shows the odds ratio (ORs) of presenting MetS as a function of biological alterations.
The multivariate analysis showed that age, eGFR, SUA, and serum GGT were independently associated with MetS (Table 2). Specifically, there was a statistically significant, dose-response effect between the eGFR and MetS; relative to patients with eGFR > 90 mL/min, those with eGFR between 60–90 mL/min and those with eGFR < 60 mL/min were 1.93 (95% confidence interval [CI]: 1.18–3.15) and 5.61 (95% CI: 1.66-19.0) times more likely to have MetS, respectively. Furthermore, the odds of MetS were significantly higher in patients with hyperuricemia (OR = 2.28, 95% CI: 1.36–3.82) as compared to those with normal SUA levels, as well as in those with serum GGT > 50 U/L (OR = 3.67, 95% CI: 1.80–7.46) as compared to those with normal serum GGT levels. In addition, MetS was significantly associated with age (OR = 1.03; 95% CI: 1.01–1.05, for every increase of 1 year in age).
Table 2
Logistic regression model for the associations of MetS in 728 patients with alcohol abuse or dependence admitted for detoxification.
| OR (95%CI) | p value | Multivariate aOR (95%CI) | p value |
Age: increase of 1 year | 1.04 (1.02–1.06) | < 0.001 | 1.03 (1.01–1.05) | 0.013 |
eGFR (mL/min) > 90 60–90 < 60 | 1 2.10 (1.32–3.33) 8.08 (2.74–23.8) | 0.002 < 0.001 | 1 1.93 (1.18–3.15) 5.61 (1.66-19.0) | 0.008 0.006 |
GGT > 50 (U/L) | 3.56 (1.81–6.99) | < 0.001 | 3.67 (1.80–7.46) | < 0.001 |
Hyperuricemia* | 3.36 (2.07–5.45) | < 0.001 | 2.28 (1.36–3.82) | 0.002 |
* urate > 7.2 mg/dL in men and > 6 mg dL in women |
eGFR: estimated glomerular filtration rate; GGT: gamma-glutamyl transferase; OR: odds ratio |
ESR: erythrocyte sedimentation rate; eGFR: estimated glomerular filtration rate; AST: aspartate aminotransferase, ALT: alanine aminotransferase; GGT: gamma-glutamyl transferase; OR: odds ratio |
The regression model showed adequate fit as measured by the Hosmer-Lemeshow statistic (χ2 = 182.1, p = 0.974).
Sensitivity analysis
A sensitivity analysis taking into account BMI values > 25 kg/m2 showed a MetS prevalence of 20.5%, and the associations with MetS were consistent with those presented in the main analysis.