²¹⁰Po Log-normal distribution in human urines: Survey from Central Italy people

Figures & data

Table 1.  Descriptive statistics of sample.

	Min	Max	Mean (SD)	n
Smokers
Age	19	75	43.3(16.2)
Years ofsmoking	1	60	23.9(14.3)
N.cigarettes/day	5	40	14.3(7.6)
Sex
Males				19
Females				20
Non-smokers
Age	5	84	37.3(23.8)
Sex
Males				40
Females				53

Table 2.  ²¹⁰Po extraction rate (mBq/d) in smokers and non-smokers groups (minimum and maximum value, mean and SD).

Po-210 (mBq/d)	Min	Max	Mean (SD)
Smokers	1.3	73.5	11.7(13.5)
Non-smokers	0.45	58.3	9.8(10.6)

Figure 1.  Correlation between daily average number of cigarettes smoked and Log ²¹⁰Po extraction rate (mBql/d) (p < 0.01).

Figure 2.  Distribution of Log ²¹⁰Po extraction rate (mBq/d); in bold line the estimated normal distribution.

Figure 3.  P-P plot of ²¹⁰Po extraction rates (raw data and Logtransformed data).

Table 3.  ANCOVA results considering Log ²¹⁰Po extraction rate as depending variable

Factor and covariates	df	F	Sig.
Years of smoking	1	5.44	0.021
Number of cigarettes	1	7.72	0.006
Age	1	23.29	0.000
Sex	1	5.69	0.019
Error	128
Total	133

Figure 4.  Lognormal estimated distributions. Vertical bars indicate the 95th, 97.5th, and 99th percentiles of URL for non-smokers (a1, a2, a3) and smokers (b1, b2, b3) sub-samples.

Figure 5.  Lognormal estimated distributions. Vertical bars indicate the 95th, 97.5th, and 99th percentiles of URL for age < 30 (a1, a2, a3) and age ≥ 30 (b1, b2, b3) sub-samples.

Figure 6.  Lognormal estimated distributions. Vertical bars indicate the 95th, 97.5th, and 99th percentiles of URL for female (a1, a2, a3) and male (b1, b2, b3) sub-samples.