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Table 1 Polish children and adolescents (the OLAF study sample) mean height z-scores relative to the six references and statistical testing

From: The height-, weight-, and BMI-for-age of Polish school-aged children and adolescents relative to international and local growth references

reference N Mean 95% CI SD p Min. Max.
boys        
WHO 2007 6227 0.50 0.47 0.52 0.99 <.0001 -3.03 4.37
USCDC2000 6227 0.45 0.43 0.48 0.97 <.0001 -2.79 4.02
Krakow 6227 0.17 0.15 0.20 1.02 <.0001 -3.37 3.85
Warszawa 6227 0.08 0.05 0.11 1.06 <.0001 -3.63 4.07
Poznan 6227 0.05 0.03 0.08 1.09 0.0001 -3.73 4.08
Lodz 6227 0.14 0.11 0.16 1.04 <.0001 -3.66 3.88
girls        
WHO 2007 6558 0.34 0.32 0.37 0.95 <.0001 -3.47 4.29
USCDC2000 6558 0.33 0.31 0.36 0.94 <.0001 -3.03 3.95
Krakow 6558 0.09 0.07 0.12 1.03 <.0001 -3.34 4.33
Warszawa 6558 0.01 -0.02 0.03 1.05 0.6338 -3.73 4.19
Poznan 6558 -0.06 -0.09-0.03 1.11 <.0001 -3.86 4.57
Lodz 6558 0.15 0.13 0.18 1.03 <.0001 -3.49 4.43