3. The data in Table 3.1 are from an investigation of an outbreak of severe abdominal pain, persistent vomiting, and generalized weakness among residents of a rural village. The cause of the outbreak was eventually identified as flour unintentionally contaminated with lead dust. Table 3.1 Age and Blood Lead Levels (BLLS) of Ill Villagers and Family Members - Country X, 1996 Age (Years) BLL' Age (Years) ID Log1,BLL ID BLL Log1,BLL 1.84 2.01 1.66 1.89 1.70 1.81 1.83 1.90 1.76 1.93 1.88 1.76 ? 1.41 2.02 1.59 1.54 1.86 1.76 1.58 1.64 3 4 69 45 49 84 48 58 17 76 61 78 48 57 68 22 23 24 25 26 27 33 33 35 35 103 46 78 1 2 3 1.66 1.69 1.92 7 9 10 11 12 13 14 15 15 16 16 1.68 1.77 1.23 1.88 1.79 1.89 1.68 1.76 1.83 ? 1.42 1.89 1.75 36 38 67 79 7 8 28 29 30 31 32 33 34 35 36 37 38 39 40 41 45 47 49 56 60 65 65 86 76 58 10 11 12 13 14 15 16 17 18 19 20 21 26 104 39 35 72 57 38 44 26 78 56 54 73 17 19 19 20 22 26 27 1.73 1.86 1.87 1.80 74 63 78 1 Blood lead levels measured in micrograms per deciliter (mcg/dl) ? Missing value Data Source: Nasser A, Hatch D, Pertowski C, Yoon S. Outbreak investigation of an unknown illness in a rural village, Egvpt (case study). Cairo: Field Epidemiology Training Program, 1999. 1. Summarize the blood level data with a frequency distribution. 2. Calculate the arithmetic mean. 3. Identify the median and interquartile range. 4. Calculate the standard deviation. 5. Select and draw the most appropriate method (graph/chart) in presenting this data. Explain why you selected that type of method.
3. The data in Table 3.1 are from an investigation of an outbreak of severe abdominal pain, persistent vomiting, and generalized weakness among residents of a rural village. The cause of the outbreak was eventually identified as flour unintentionally contaminated with lead dust. Table 3.1 Age and Blood Lead Levels (BLLS) of Ill Villagers and Family Members - Country X, 1996 Age (Years) BLL' Age (Years) ID Log1,BLL ID BLL Log1,BLL 1.84 2.01 1.66 1.89 1.70 1.81 1.83 1.90 1.76 1.93 1.88 1.76 ? 1.41 2.02 1.59 1.54 1.86 1.76 1.58 1.64 3 4 69 45 49 84 48 58 17 76 61 78 48 57 68 22 23 24 25 26 27 33 33 35 35 103 46 78 1 2 3 1.66 1.69 1.92 7 9 10 11 12 13 14 15 15 16 16 1.68 1.77 1.23 1.88 1.79 1.89 1.68 1.76 1.83 ? 1.42 1.89 1.75 36 38 67 79 7 8 28 29 30 31 32 33 34 35 36 37 38 39 40 41 45 47 49 56 60 65 65 86 76 58 10 11 12 13 14 15 16 17 18 19 20 21 26 104 39 35 72 57 38 44 26 78 56 54 73 17 19 19 20 22 26 27 1.73 1.86 1.87 1.80 74 63 78 1 Blood lead levels measured in micrograms per deciliter (mcg/dl) ? Missing value Data Source: Nasser A, Hatch D, Pertowski C, Yoon S. Outbreak investigation of an unknown illness in a rural village, Egvpt (case study). Cairo: Field Epidemiology Training Program, 1999. 1. Summarize the blood level data with a frequency distribution. 2. Calculate the arithmetic mean. 3. Identify the median and interquartile range. 4. Calculate the standard deviation. 5. Select and draw the most appropriate method (graph/chart) in presenting this data. Explain why you selected that type of method.
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Transcribed Image Text:Introduction to Biostatistics and Epidemiology
LABORATORY SESSION 4 and 5: ACTIVITY GUIDE
Measures of Central Tendency & Variability and Displaying Public Health Data
3. The data in Table 3.1 are from an investigation of an outbreak of severe abdominal pain,
persistent vomiting, and generalized weakness among residents of a rural village. The
cause of the outbreak was eventually identified as flour unintentionally contaminated with
lead dust.
Table 3.1 Age and Blood Lead Levels (BLLS) of Ill Villagers and Family Members – Country X, 1996
Age
(Years)
Age
(Years)
ID
BLL
Log10BLL
ID
BLL
Log10BLL
69
1.84
1.66
1.69
1.92
1.68
1.77
1.23
1.88
1.79
1.89
1.68
1.76
1.83
1
3
22
33
103
2.01
1.66
1.89
1.70
1.81
1.83
1.90
1.76
1.93
1.88
1.76
2
4
45
23
33
46
3
6
7
9
10
49
24
84
48
58
35
35
36
36
38
78
50
64
67
25
26
27
28
29
30
31
32
33
34
4
5
6
7
8
9
10
11
12
11
17
79
12
76
40
58
13
14
15
15
61
78
48
57
45
47
49
56
86
76
58
?
26
1.41
2.02
1.59
1.54
1.86
1.76
13
16
68
60
14
16
35
65
104
1.42
15
16
17
18
19
17
19
19
20
26
78
56
54
73
1.89
1.75
1.73
1.86
36
37
38
39
65
65
70
70
39
35
72
57
22
40
76
38
1.58
20
26
74
1.87
41
78
44
1.64
21
27
63
1.80
+ Blood lead levels measured in micrograms per deciliter (mcg/dL)
? Missing value
Data Source: Nasser A, Hatch D, Pertowski C, Yoon S. Outbreak investigation of an unknown illness in a rural village, Egypt (case
study). Cairo: Field Epidemiology Training Program, 1999.
1. Summarize the blood level data with a frequency distribution.
2. Calculate the arithmetic mean.
3. Identify the median and interquartile range.
4. Calculate the standard deviation.
5. Select and draw the most appropriate method (graph/chart) in presenting this data. Explain
why you selected that type of method.
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