Skip to main content

Table 4 Differences in 25(OH)D between subgroups by their mean ranks

From: Vitamin D levels in schoolchildren: a cross-sectional study in Kuwait

Variable Catagories Total (n = 199) Boys (n = 93) Girls (n = 106)
Mean rank p-value Mean rank p-value Mean rank p-value
Governorate    0.559   0.300   0.953
  Asma 97.13   51.68   50.18  
  Hawalli 102.63   53.10   55.38  
  Farwania 93.76   35.03   56.80  
  Mubarak Al-Kabir 114.30   50.06   57.75  
  Ahmedi 90.59   53.72   50.58  
  Jahara 98.62   41.91   56.39  
Age years    0.016   0.045   0.025
  5.5–6.49 136.65   73.50   67.60  
  6.5–7.49 110.39   39.42   71.57  
  7.5–8.49 112.98   55.60   52.83  
  8.5–9.49 89.25   45.44   42.96  
  9.5–10.49 80.57   35.58   48.54  
  10.5–11.0 93.92   44.33   46.93  
Obesity index    0.084   0.214   0.044
  non 107.85   51.47   59.10  
  overweight 91.41   44.02   48.28  
  obese 87.42   40.02   39.00  
Skin color    0.505   0.936   0.010
  light 105.65   45.34   62.20  
  medium 98.51   47.68   50.62  
  dark 88.65   47.23   24.33  
Sun exposure    0.618   0.465   0.663
  up to 5 min 97.38   49.04   51.40  
  up to 15 min 97.34   39.47   58.13  
  up to 30 min 106.09   48.03   53.96  
Physical activity    0.650   0.170   0.922
  rarely 90.20   39.88   57.41  
  weekly 110.85   54.87   54.90  
  daily 98.35   44.65   52.26  
  1. Bold P-value indicates significant difference in 25(OH)D between subgroups using Kruskall-Wallis H test