. 2022 Oct 29;106(2):401–411. doi: 10.1093/jaoacint/qsac130

Table 7.

Matrix study: 3M Petrifilm RYM Plate 28°C at 60 h versus DRBC—difference of means

Matrix	Contamination level	3M Petrifilm RYM Plate, 28°C; 60 h		DRBC		DOM^d	SE^e	90% CI^a		95% CI
Matrix	Contamination level	Mean^b	s_r^c	Mean	s_r	DOM^d	SE^e	LCL^f	UCL^g	LCL	UCL
Cannabis Flower^h	Low	2.817	0.204	3.061	0.226	−0.244	0.114	−0.486	−0.001	−0.560	0.072
Cannabis Flower^h	High	5.432	0.188	5.539	0.143	−0.107	0.054	−0.221	0.007	−0.256	0.042

CI = Confidence interval for DOM.

Mean of five replicate portions, after logarithmic transformation: log10[cfu/g + (0.1)f] where f is the smallest reportable result.

Repeatability standard deviation.

DOM = Difference of means.

Standard error of the mean difference for paired analysis.

LCL = Lower confidence limit for DOM.

UCL = Upper confidence limit for DOM.

Matrix samples tested at Aurum Laboratories.