Table 3.

Statistical results summary

Dust type	Relative humidity (RH)	Test instrument	Slope value	Slope 95% LCL	Slope 95% UCL	Intercept value	Intercept 95% LCL	Intercept 95% UCL	R2 value	SEE
ISO FINE	30	PRD1500	1.506	1.495	1.516	76.736	69.450	84.023	0.991	1.175
	30	AM520	0.821	0.814	0.829	57.747	43.975	71.519	0.984	1.190
	60	PRD1500	1.478	1.470	1.486	61.509	55.298	67.720	0.994	1.147
	60	AM520	0.846	0.839	0.854	−18.800	−33.481	−4.120	0.985	1.162
	90	PRD1500	1.519	1.504	1.534	−10.781	−27.340	5.778	0.984	1.256
	90	AM520	0.896	0.884	0.909	−206.648	−235.145	−178.152	0.969	1.223
ISO	30	PRD1500	1.632	1.622	1.643	8.895	1.851	15.940	0.993	1.138
COARSE	30	AM520	0.859	0.851	0.867	56.151	46.640	65.662	0.984	1.132
	90	PRD1500	1.496	1.484	1.509	51.656	41.361	61.951	0.986	1.107
	90	AM520	0.982	0.976	0.989	−57.222	−71.390	−43.064	0.991	1.165
SAND	30	PRD1500	1.627	1.587	1.666	74.048	53.840	94.246	0.975	0.012
	30	AM520	0.949	0.919	0.979	82.201	52.447	111.955	0.958	0.112
	90	PRD1500	1.610	1.578	1.642	53.584	27.374	79.794	0.976	0.401
	90	AM520	0.990	0.963	1.018	−25.562	−66.934	15.202	0.953	0.350
METAL	30	PRD1500	1.879	1.869	1.890	32.282	26.594	38.171	0.995	1.205
	30	AM520	1.159	1.148	1.170	−29.869	−42.540	−17.198	0.985	1.147
	90	PRD1500	1.794	1.784	1.804	87.964	82.397	93.531	0.994	1.247
	90	AM520	1.156	1.146	1.167	17.924	4.961	30.886	0.982	1.155
SILICA	30	PRD1500	1.517	1.502	1.531	−0.899	−14.286	12.487	0.990	1.215
	30	AM520	1.013	1.001	1.025	−138.127	−158.842	−117.412	0.978	1.624
	90	PRD1500	1.491	1.483	1.499	72.362	65.306	79.417	0.995	1.151
	90	AM520	0.829	0.821	0.836	48.056	35.182	60.929	0.985	0.460
LIMESTONE	30	PRD1500	1.373	1.365	1.380	57.921	52.236	63.515	0.995	1.191
	30	AM520	0.746	0.739	0.752	67.148	55.541	78.756	0.987	1.151
	90	PRD1500	1.318	1.308	1.327	101.240	93.357	109.122	0.992	1.207
	90	AM520	0.758	0.750	0.766	62.639	46.933	78.345	0.983	1.175

LCL, lower confidence limit; UCL, upper confidence limit; SEE, standard error of the estimate