Table 3 Multivariate-adjusted odds ratios (95% confidence intervals) for high UNa/K ratios in participants according to the extent of house collapse

From: Association between the extent of house collapse and urine sodium-to-potassium ratio of victims affected by the 2011 Great East Japan Earthquake and Tsunami: a cross-sectional study

 

Extent of house collapse

TC

HC

PC

ND

Total (n = 29,542)

 Number of participants

5359

3576

7331

13,276

 Number of cases with a high UNa/K ratio

1350

970

1964

3124

 Crude OR (95% CI)

1.09 (1.02–1.18)

1.21 (1.11–1.32)

1.19 (1.11–1.27)

Reference

 P-value

0.016

<0.001

<0.001

 

 Sex- and age-adjusted OR (95% CI)

1.09 (1.02–1.18)

1.21 (1.12–1.32)

1.19 (1.12–1.28)

Reference

 P-value

0.019

<0.001

<0.001

 

 Multivariate-adjusted OR (95% CI) (Model 1)

1.07 (0.99–1.15)

1.20 (1.11–1.31)

1.20 (1.12–1.28)

Reference

 P-value

0.074

<0.001

<0.001

 

 Multivariate-adjusted OR (95% CI) (Model 2)

1.08 (0.99–1.19)

1.20 (1.11–1.31)

1.20 (1.12–1.28)

Reference

 P-value

0.087

<0.001

<0.001

 

 Multivariate-adjusted OR (95% CI) (Model 3)

1.08 (0.997–1.16)

1.22 (1.12–1.33)

1.23 (1.15–1.31)

Reference

 P-value

0.058

<0.001

<0.001

 

Men (n = 10,805)

 Number of participants

1958

1309

2738

4800

 Number of cases with a high UNa/K ratio

491

363

731

1121

 Crude OR (95% CI)

1.10 (0.97–1.24)

1.26 (1.10–1.45)

1.20 (1.07–1.33)

Reference

 P-value

0.132

0.001

0.001

 

 Age-adjusted OR (95% CI)

1.09 (0.97–1.23)

1.26 (1.10–1.45)

1.20 (1.08–1.34)

Reference

 P-value

0.167

0.001

<0.001

 

 Multivariate-adjusted OR (95% CI) (Model 1)

1.08 (0.96–1.23)

1.26 (1.10–1.45)

1.22 (1.09–1.36)

Reference

 P-value

0.211

0.001

<0.001

 

 Multivariate-adjusted OR (95% CI) (Model 2)

1.06 (0.91–1.24)

1.26 (1.09–1.44)

1.22 (1.09–1.36)

Reference

 P-value

0.430

0.001

<0.001

 

 Multivariate-adjusted OR (95% CI) (Model 3)

1.08 (0.95–1.22)

1.27 (1.11–1.46)

1.25 (1.12–1.39)

Reference

 P-value

0.233

<0.001

<0.001

 

Women (n = 18,737)

 Number of participants

2401

2267

4593

8476

 Number of cases with a high UNa/K ratio

859

607

1233

2003

 Crude OR (95% CI)

1.09 (0.996–1.20)

1.18 (1.06–1.31)

1.19 (1.09–1.29)

Reference

 P-value

0.061

0.002

<0.001

 

 Age-adjusted OR (95% CI)

1.09 (0.998–1.20)

1.19 (1.07–1.32)

1.19 (1.10–1.29)

Reference

 P-value

0.056

0.002

<0.001

 

 Multivariate-adjusted OR (95% CI) (Model 1)

1.06 (0.97–1.17)

1.18 (1.06–1.31)

1.19 (1.09–1.29)

Reference

 P-value

0.200

0.003

<0.001

 

 Multivariate-adjusted OR (95% CI) (Model 2)

1.10 (0.98–1.23)

1.18 (1.06–1.31)

1.19 (1.09–1.29)

Reference

 P-value

0.121

0.002

<0.001

 

 Multivariate-adjusted OR (95% CI) (Model 3)

1.07 (0.98–1.18)

1.20 (1.08–1.33)

1.22 (1.12–1.33)

Reference

 P-value

0.150

0.001

<0.001

 
  1. Multivariate-adjusted ORs (Model 1) for high UNa/K ratios were calculated using a logistic regression model with adjustment for age, sex, body mass index, current smoking, current drinking and regular exercise, living alone or not, and having a decreased income or not
  2. Multivariate-adjusted ORs (Model 2) for high UNa/K ratios were calculated using a logistic regression model with adjustment for age, sex, body mass index, current smoking, current drinking and regular exercise, living alone or not, having a decreased income or not, and residential state
  3. Multivariate-adjusted ORs (Model 3) for high UNa/K ratios were calculated using a logistic regression model with adjustment for age, sex, body mass index, systolic blood pressure, estimated glomerular filtration rate, hemoglobin A1c and low-density lipoprotein cholesterol levels, K6 score, current smoking, current drinking and regular exercise, living alone or not, and having a decreased income or not
  4. The cutoff was the 75th percentile in UNa/K ratio for each sex in the study group. The UNa/K ratio in the 75th percentile or higher was defined as “high UNa/K ratio.” The 75th percentile in UNa/K ratio was 5.09% for men and 4.76% for women
  5. UNa/K ratio urine sodium-to-potassium ratio, TC total collapse, HC half collapse, PC partial collapse, ND no damage, OR odds ratio, CI confidence interval
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