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Table 2 Sample characteristics by trial arm

From: Randomised controlled trial comparing uptake of NHS Health Check in response to standard letters, risk-personalised letters and telephone invitations

  Standard letter Telephone Personalised letter Total Difference
n % N % n % n % χ2 df
Total 1454   1167   1993   4614    
 Age
  40–54 1108 76.2 896 76.8 1462 73.4 3466 75.1 16.00*** 2
  55–64 224 15.4 207 17.7 382 19.2 813 17.6   
  65–74 122 8.4 64 5.5 149 7.5 335 7.3   
  Missing 0   0   0   0    
 Gender
  Male 713 49.0 534 45.8 948 47.6 2195 47.6 2.79 1
  Female 741 51.0 633 54.2 1045 52.4 2419 52.4   
  Missing 0   0   0   0    
 Ethnicity
  White British 1100 93.9 915 95.1 1461 93.3 3476 93.9 3.49 1
  Non-WBRI 72 6.1 47 4.9 105 6.7 224 6.1   
  Missing 282   205   427   914    
 BMI (kg/m2)
  Healthy range 480 33.0 405 34.7 653 32.8 1538 33.3 3.77 3
  Overweight 458 31.5 375 32.1 660 33.1 1493 32.4   
  Obese 312 21.5 240 20.6 380 19.1 932 20.2   
  Morbidly obese 39 2.7 34 2.9 58 2.9 131 2.8   
  Missing 165   113   242   520    
 CVD risk
  Low 1295 89.1 1064 91.2 1752 88.0 4111 89.1 9.51 2
  Moderate 140 9.6 86 7.4 203 10.2 429 9.3   
  High 19 1.3 17 1.5 38 1.9 74 1.6   
  Missing 0   0   0   0    
 Deprivation (quintile)
  1 (most deprived) 226 15.5 180 15.4 379 19.0 785 17.0 39.72*** 4
  2 285 19.6 233 20.0 469 23.6 987 21.4   
  3 322 22.1 233 20.0 406 20.4 961 20.8   
  4 461 31.7 410 35.1 524 26.3 1395 30.2   
  5 160 11.0 111 9.5 213 10.7 484 10.5   
  Missing 0   0   2   2    
 Area morphology
  Urban 1121 77.1 851 72.9 1571 78.9 3543 76.8 14.88*** 1
  Rural 333 22.9 316 27.1 420 21.1 1069 23.2   
  Missing 0 0.00 0 0.00 2 0.10 2 0.04   
  1. BMI, Body Mass Index; *** p < 0.01