Table 2:

Some descriptive statistical parameters for Mufulira and Nkana respirable dust samples

Descriptive	Crystalline SiO2content quartz (%)		Total respirable dust (mg/m3)		Respirable crystalline SiO2quartz (mg/m3)
	Mufulira	Nkana	Mufulira	Nkana	Mufulira	Nkana
Count	87	85	101	102	101	102
Mean	17.5	13.6	0.992	0.868	0.143	0.060
Stdev	12.0	12.4	1.162	1.246	0.197	0.059
Minimum	1.5	0.9	0.000	0.000	0.000	0.000
Maximum	82.5	62.5	7.674	6.944	1.302	0.317
Percentile 5th	3.8	2.1	0.043	0.056	0.014	0.015
Percentile 10th	5.8	2.8	0.069	0.069	0.017	0.016
Percentile 25th	9.6	4.7	0.258	0.109	0.029	0.020
Median	16.8	9.0	0.735	0.366	0.098	0.039
Percentile 75th	20.3	20.0	1.244	1.279	0.160	0.082
Percentile 90th	25.8	29.7	2.286	2.242	0.262	0.130
Percentile 95th	40.9	37.1	3.023	2.725	0.400	0.166