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. 2020 Jan 28;7(1):G1–G18. doi: 10.1530/ERP-19-0050

Figure 1.

Figure 1

The normal distribution curve. Using a combination of the population mean and standard deviation, reference limits can be calculated. A range of values encompassing 2 standard deviations above and below the population mean includes 96.4% of all ‘normal’ subjects. Similarly, 3 standard deviations encompass 99.7% of the normal population.