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

Table 4.

Matrix study: 3M Petrifilm RYM Plate 25°C at 72 h versus DRBC—difference of means

Matrix	Contamination level	3M Petrifilm RYM Plate, 25°C; 72 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	3.281	0.094	3.688	0.218	−0.407	0.106	−0.577	−0.236	−0.629	−0.185
	Med	3.816	0.042	3.906	0.047	−0.09	0.028	−0.12	−0.06	−0.129	−0.051
	High	5.139	0.063	5.145	0.204	−0.005	0.064	0.143	0.132	−0.184	0.174
Cannabis Flowerⁱ	Low	2.850	0.222	3.151	0.211	−0.301	0.121	−0.468	0.047	−0.403	−0.199
Cannabis Flowerⁱ	High	5.435	0.180	5.539	0.143	−0.105	0.075	−0.264	0.055	−0.379	−0.222

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 North Coast Laboratories.

ⁱ

Matrix samples tested at Aurum Laboratories.