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Table 2 Sociodemographic and osteoarthritis characteristics by absenteeism among respondents with osteoarthritis in Japan, 2014

From: Work impairment, osteoarthritis, and health-related quality of life among employees in Japan

   Absenteeisma  
Total (N = 233) Absenteeism (N = 25) No Absenteeism (N = 200) p-value*
Female (%, N) 43.8% 102 52.0% 13 43.5% 87 0.420
Age (Mean, SD) 54.2 12.2 46.1 15.3 55.4 11.3 < 0.001
Married or living with partner (%, N) 66.5% 155 64.0% 16 68.0% 136 0.687
Annual household income (%, N)        0.204
  < ¥3million 14.2% 33 8.0% 2 15.0% 30  
 ¥3million to <¥5million 20.6% 48 16.0% 4 21.0% 42  
 ¥5million to <¥9million 36.5% 85 32.0% 8 37.5% 75  
 ¥9million or more 21.0% 49 40.0% 10 18.0% 36  
 Decline to answer 7.7% 18 4.0% 1 8.5% 17  
Education (%, N)        0.584
 Junior/High School 31.1% 70 24.0% 6 32.0% 64  
 2-year college 14.2% 32 20.0% 5 13.5% 27  
 4-year college 50.2% 113 48.0% 12 50.5% 101  
 Graduate school 4.4% 10 8.0% 2 4.0% 8  
CCI (Mean, SD) 1.1 4.8 3.1 8.0 0.7 3.3 0.006
BMI categories (%, N)        0.557
 Underweight (< 18.5) 7.7% 18 8.0% 2 8.0% 16  
 Normal (18.5–24.9) 61.4% 143 68.0% 17 60.5% 121  
 Overweight (25.0–29.9) 22.7% 53 12.0% 3 23.5% 47  
 Obese (30.0+) 6.9% 16 12.0% 3 6.5% 13  
 Decline to answer 1.3% 3 0.0% 0 1.5% 3  
Smoking status (%, N)        0.055
 Current smoker 26.2% 61 44.0% 11 23.0% 46  
 Former smoker 34.3% 80 20.0% 5 37.0% 74  
 Never smoker 39.5% 92 36.0% 9 40.0% 80  
Drinks alcohol (%, N) 75.5% 176 84.0% 21 75.0% 150 0.421
Exercise (%, N) 51.1% 119 56.0% 14 49.0% 98 0.509
Length of arthritis diagnosis, yearsa (Mean, SD) 8.4 11.3 12.0 16.2 7.9 10.5 0.100
Number of joints affected (Mean, SD) 2.0 1.9 1.8 2.2 1.9 1.7 0.712
Site affected by arthritis
 Ankles 15.9% 37 20.0% 5 14.5% 29 0.551
 Elbows 13.3% 31 12.0% 3 13.5% 27 1.000
 Feet 14.6% 34 20.0% 5 14.0% 28 0.382
 Fingers/Hands 26.2% 59 20.0% 5 27.0% 54 0.453
 Hips 14.2% 33 24.0% 6 12.5% 25 0.126
 Knees 51.9% 121 32.0% 8 54.0% 108 0.055
 Neck 10.3% 24 8.0% 2 10.5% 21 1.000
 Shoulders 14.2% 33 8.0% 2 15.0% 30 0.544
 Spine 3.0% 7 4.0% 1 2.5% 5 0.511
 Wrists 16.7% 39 20.0% 5 16.5% 33 0.584
 Other 6.0% 14 8.0% 2 5.5% 11 0.643
Severity of arthritis (%, N)        0.356
 Mild 51.5% 120 56.0% 14 52.0% 104  
 Moderate 38.6% 90 28.0% 7 39.0% 78  
 Severe 9.9% 23 16.0% 4 9.0% 18  
Frequency of problems with arthritis (%, N)        0.032
 Daily 33.0% 77 24.0% 6 33.0% 66  
 4–6 times a week 7.7% 18 16.0% 4 6.5% 13  
 2–3 times a week 12.9% 30 32.0% 8 11.0% 22  
 Once a week 2.6% 6 0.0% 0 3.0% 6  
 2–3 times a month 14.2% 33 12.0% 3 15.0% 30  
 Once a month or less often 29.6% 69 16.0% 4 31.5% 63  
Use a prescription for OA (%, N) 32.6% 76 44.0% 11 31.0% 62 0.015
  1. Note: BMI body mass index, CCI Charlson Comorbidity Index, OA osteoarthritis
  2. *Differences between none vs. any absenteeism were performed using t-tests for continuous variables and chi-square or Fisher exact (cells < 5) tests for categorical variables
  3. aData for absenteeism were missing for eight respondents. Data for length of diagnosis were missing for an additional 12 respondents overall