Table 1.

Descriptive statistics for the dataset on which the EIRM is based, as of August 2017.

Number of non-empty cells	27,544
Total number of measurements	1,154,373
Measurements per cell, MED (MAD)	4 (4.4)
Min/Max number of measurements per cell	1/23,993
Cell mean, AM ± CV %	103.2 Bq/m3 ± 139%
Cell median, MED (MADI)	60.0 ( 46.0) Bq/m3
Percentage cell AM > 300 Bq/m3	4.34%
Percentage cell AM > 100 Bq/m3	34.3%
CV within cells, MED ( MAD)	66.8 (34.0) %
GSD within cells, MED (MAD)	1.88 (0.68)

CV, coefficient of variation, where CV = SD/AM; MAD = MED(│x-MED(x)│).