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Table 6

SIR assignment for non-dissolved barium^a (mg/L)

Location	Cooler	Kitchen	Kitchen filtered	Ladies’ toilet	Men's toilet
Cluster	0.022 Settled precipitate	0.003 Suspended	0 Suspended removed	0 No precipitate	0.001 Settled precipitate
Risk assignment, biostatistics SIR	6.02^b Brisbane IBC SIR, medical primary scope (AEA7), i.e. for the likely culprit water sample	1 Judged as all Brisbane domestic equivalent where IBC could have occurred	0	0	0.33
Comparison	−0.001 Settled precipitate transported resuspended/redissolved	0.001 Suspended	0 Suspended removed	0 No precipitate	0.001 Settled precipitate
Risk assignment, biostatistics SIR	−0.33 Minus sign reflects the reverse of the precipitation reaction	0.33	0	0	0.33

Location	Cooler	Kitchen	Kitchen filtered	Ladies’ toilet	Men's toilet
Cluster	0.022 Settled precipitate	0.003 Suspended	0 Suspended removed	0 No precipitate	0.001 Settled precipitate
Risk assignment, biostatistics SIR	6.02^b Brisbane IBC SIR, medical primary scope (AEA7), i.e. for the likely culprit water sample	1 Judged as all Brisbane domestic equivalent where IBC could have occurred	0	0	0.33
Comparison	−0.001 Settled precipitate transported resuspended/redissolved	0.001 Suspended	0 Suspended removed	0 No precipitate	0.001 Settled precipitate
Risk assignment, biostatistics SIR	−0.33 Minus sign reflects the reverse of the precipitation reaction	0.33	0	0	0.33

^aLikely together with calcium.

^bAdjustment of the above, 6.02 only was required for the development of other cases, below.