Table 1 Comparison of study participants after classifying participation status after the 2012 survey.

From: Loss of participation among evacuees aged 20–37 years in the disaster cohort study after the Great East Japan Earthquake

Variables in 2011 survey

Participation in health checkups after 2012

p value

No

Yes

(n = 4029)

(n = 5691)

Age; n (%)

  

< 0.001

≤ 24 years

921 (23)

791 (14)

 

25–29 years

1041 (26)

1401 (25)

 

30–33 years

961 (24)

1546 (27)

 

≥ 34 years

1106 (26)

1953 (34)

 

Gender—men; n (%)

1879 (47)

1877 (33)

< 0.001

Body mass index (kg/m2)

  

< 0.001

< 18.5

407 (10)

747 (13)

 

18.5–22.9

1938 (48)

2801 (49)

 

23.0–24.9

658 (16)

818 (14)

 

25.0–29.9

696 (17)

920 (16)

 

≥ 30.0

330 (8)

405 (7)

 

Systolic blood pressure (mmHg)

115 (14)

114 (14)

< 0.001

Diastolic blood pressure (mmHg)

70 (11)

69 (11)

0.006

Evacuation; n (%)

  

< 0.001

Within municipality

1260 (31)

2211 (39)

 

Outside municipality but within Fukushima prefecture

2023 (50)

2395 (42)

 

Outside Fukushima prefecture

746 (19)

1085 (19)

 

Disease history; n (%)

Hypertension

42 (1.1)

50 (0.9)

0.46

Cerebrovascular disease

12 (0.3)

11 (0.2)

0.4

Heart disease

26 (0.7)

65 (1.2)

0.01

Anemia

422 (10.7)

645 (11.7)

0.12

Diabetes mellitus

20 (0.5)

31 (0.6)

0.78

Dyslipidemia

21 (0.5)

46 (0.8)

0.11

Kidney disease

59 (1.7)

85 (1.7)

0.8

Smoking history; n (%)

1512 (38.2)

1629 (29.4)

< 0.001

Drinking habit; n (%)

2019 (51.0)

2460 (44.3)

< 0.001

Laboratory results on metabolic outcomes

Hemoglobin A1c (%)

5.1 (0.6)

5.1 (0.5)

0.54

LDL-C (mg/dL)

112 (31)

112 (30)

0.86

Triglyceride (mg/dL)

91 (75)

89 (72)

0.22

  1. The numbers (percentages of non-participation or control groups) are shown. Two-group comparisons between the non-participation cohort and the control were performed with the independent t-tests and Pearson’s chi-square tests on continuous and categorical data, respectively.
  2. LDL-C low-density lipoprotein cholesterol.