132 BIOLOGICAL EFFECTS OF LOW LEVEL EXPOSURES
Table 7.5. Poisson Distribution 95% Normal Limits for Observed Number of Events, 95% Confidence Limits for Expected Number of Events,
and 95% Confidence Limits for Standardized Ratios of Observed to Expected Number of Events
A. Lower Normal Limit or Upper Confidence Limit
0123456789
I
3^60
5^57
7^22
8T7
10.24
11.67
13.06
14.42
15.76
17.08
1
18.39
19.68
20.96
22.23
23.49
24.74
25.98
27.22
28.45
29.67
2
30.89
32.10
33.31
34.51
35.71
36.90
38.10
39.28
40.47
41.65
3
42.83
44.00
45.17
46.34
47.51
48.68
49.84
51.00
52.16
53.31
4
54.47
55.62
56.77
57.92
59.07
60.21
61.36
62.50
63.64
64.78
5
65.92
67.06
68.19
69.33
70.46
71.59
72.72
73.85
74.98
76.11
6
77.23
78.36
79.48
80.61
81.73
82.85
83.97
85.09
86.21
87.32
7
88.44
89.56
90.67
91.79
92.90
94.01
95.12
96.24
97.35
98.46
8
99.57
100.67
101.79
102.89
104.00
105.10
106.21 107.31
108.42
109.52
9
110.63
111.73
112.83
113.93
115.03
116.13
117.23 118.33
119.43
120.53
10
121.63
122.72
123.82
124.92
126.01
127.11
128.20 129.30
130.39
131.48
II
132.58
133.67
134.76
135.85
136.95
138.04
139.13 140.22
141.31
142.40
12
143.49
144.58
145.67
146.76
147.85
148.93
150.02 151.10
152.19
153.28
13
154.36
155.45
156.53
157.62
158.71
159.79
160.87 161.96
163.04
164.12
14
165.20
166.29
167.37
168.45
169.54
170.62
171.70 172.77
173.86
174.94
15
176.01
177.10
178.18
179.25
180.34
181.41
182.49 183.57
184.64
185.72
16
186.80
187.88
188.96
190.04
191.11
192.19
193.27 194.34
195.42
196.49
17
197.56
198.64
199.72
200.79 201.86
202.94
204.01 205.08
206.16
207.23
18
208.30
209.37
210.45
211.52 212.59
213.67
214.73 215.81
216.88
217.96
19
219.03
220.09
221.17
222.24 223.30
224.37
225.45 226.52
227.59
228.65
20
229.72
230.79
231.86
232.92 234.00
235.07
236.14 237.20
238.27
239.34