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Table 1 Socio-demographic characteristics of occupants of sampled offices

From: Radon level in a Nigerian University Campus

Variable Frequency (76) Percent (%)
Age (years)
 21–30 9 11.8
 31–40 26 34.2
 41–50 28 36.8
 51–60 10 13.2
 61–70 3 3.9
Mean age (SD) 43.4 (9.4) years  
Number of years of office occupancy
 <1 11 14.5
 Between 1–9 48 63.2
 Between 10–20 14 18.4
 >20 3 3.9
Mean year (SD) 5.9 (5.4) years  
Average length of stay in the office/day
 Mean (SD) 7.3 (2.5) h  
 Minimum stay 2 h  
 Maximum stay 12 h