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Clinical Insights

Interpreting results with GLI-2012 using Z-score and LLN

Normal Distribution and Percentile

When the data tend to be around a central value we have a NORMAL DISTRIBUTION with a bell–shaped curve.
Relationship between STANDARD DEVIATION (SD) and percentage of data under the curve in the case of a normal distribution.

When the data tend to be around a central value we have a NORMAL DISTRIBUTION with a bell–shaped curve.

68% of measures are between +1 and –1
STANDARD DEVIATION

90% of measures are between +1.64 and –1.64
STANDARD DEVIATION

Location and meaning of the 5th percentile
The range between the 5th percentile and 95th percentile includes 90% of the population.
The 5th percentile (-1.64 STANDARD DEVIATION) is the minimum value of the observed parameter below which is only 5% of the population.

Fig. 2 – Normal Distribution and Percentile.

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