Environmental Health Criteria 214

HUMAN EXPOSURE ASSESSMENT
population. The sample consists of the individual observations from
the study population, with multiple variables or covariates recorded
for each observation. Univariate methods examine the distribution of
a single variable; multivariate methods describe relationships among
two or more variables. That is, if we consider a single observation
and know the value of one variable, multivariate methods indicate what
Table 8. Blood lead (PbB) and faeces lead (PbF) data from sample
populations in Malta and Mexico. Source: WHO, 1985b
Number
Malta Mexico
PbB PbF PbF PbB
(µg/litre) (µg/g) (µg/litre) (µg/g)
1 171 2.9 239 6.3
2 270 30.5 263 4.2
3 198 5.6 198 5.7
4 122 3.8 163 5.3
5 96 16.6 217 4.3
6 385 35.5 188 4.7
7 359 49.6 190 3.3
8 267 6.8 248 5.2
9 261 8.1 225 4.5
10 301 25.6 152 3.4
11 202 7.7 177 5.9
12 222 32.3 157 3.8
13 339 10.9 297 5.3
14 156 5.7 144 3.6
15 262 18.7 257 9.8
16 290 16.5 131 4.8
17 158 4.9 187 5.1
18 343 37.8 168 3.2
19 228 9.1 112 2.8
20 256 14.1
21 270 9.9
22 245 4.9
23 337 14.3
24 362 19.2
25 155 4.9
26 194 9
27 206 6.7
28 276 12.4
29 222 11.2
30 214 21.3
31 248 7.8
32 283 17.8
33 215 10.9
34 279 14.9
35 229 8.6
36 127 17.3
Table 8. (continued)
Number
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Malta Mexico
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