through the environment at an institute for the people with in- tellectual disabilities in Japan in 2005

Supplementary Table

An enterohemorrhagic Escherichia coli outbreak spread

through the environment at an institute for the people with in- tellectual disabilities in Japan in 2005

Masaki Ota, Taro Kamigaki, Satoshi Mimura, Kazutoshi Nakashima, and Ta- kashi Ogami

Table S1: Individual characteristics associated with EHEC O157:H7 infection in uni- variable analyses of an outbreak investigation at an institute for people with intel- lectual disabilities, Japan, 2005.

(1) Residents of Facility A

(CI = confidence interval, OR = odds ratio) Table S1: Results of univariable analyses

Individual risk factor

Yes No

OR 95%CI

Cases Controls Cases Controls Toilet use at

2nd floor male toilet 5 19 5 23 1.2 0.2–6.1

1st floor male toilet 4 14 6 28 1.3 0.2–6.7

2nd floor male toilet 1 9 11 31 0.3 0.0–2.8

1st floor male toilet 0 0 10 42 – –

Taking meals at

Table 1 3 3 7 31 4.2 0.5–39.0

Table 2 0 3 10 31 0 0.0–8.5

Table 3 2 4 8 30 1.8 0.1–15.9

Table 4 1 4 9 30 0.8 0.0–10.0

Table 5 1 3 9 31 1.1 0.11–12.4

Table 6 1 4 9 30 0.8 0.0–10.0

Table 7 1 3 9 31 1.1 0.11–12.4

Table 8 0 4 10 30 0 0.0–5.3

Table 9 0 4 10 30 0 0.0–5.3

Table 10 1 4 9 30 0.8 0.0–10.0

Playing in the Playroom 4 7 6 35 3.2 0.5–18.5

Attending the primary school

outside 4 8 6 26 2.1 0.4–11.9

Attending the junior high school

outside 2 2 8 32 3.8 0.2–60.8

Attending the senior high school

outside 2 14 8 20 0.4 0.0–2.2

(2) Residents of Facility B

Individual risk factor

Yes No

OR 95%CI

Cases Controls Cases Controls Toilet use at

2nd floor male toilet 11 14 11 25 1.8 0.5–5.9

1st floor male toilet 4 15 18 24 0.4 0.1–1.4

2nd floor male toilet 6 7 16 32 1.7 0.4–7.1

1st floor male toilet 1 3 21 36 0.6 0.0–7.7

Taking meals at

Table 1 3 1 21 37 5.1 0.4–284.3

Table 2 1 3 23 35 0.5 0.0–6.8

Table 3 2 2 22 36 1.6 0.1–23.9

Table 4 1 5 23 33 0.3 0.0–2.9

Table 5 2 4 22 34 0.8 0.1–6.0

Table 6 1 5 23 33 0.3 0.0–2.9

Table 7 5 1 19 37 9.4 1.0–471.3

Table 8 2 3 22 35 1.1 0.1–10.0

Table 9 0 6 24 32 0.0 0.0–1.3

Table 10 1 4 23 34 0.4 0.0–4.1

Bathing in the morning among

males 8 16 9 12 0.7 0.2–2.6

Bathing in early afternoon

among females 5 3 2 7 5.2 0.5–86.1

(3) Residents and participants in activities of Facility C

Individual risk factor

Yes No

OR 95%CI

Cases Controls Cases Controls Vocational training group

Activity 1 10 28 7 31 1.6 0.5–5.6

Activity 2 0 4 17 55 0.0 0.0–5.4

Activity 3 13 32 4 27 2.7 0.7–12.8

Activity 4 5 9 12 50 2.3 0.5–9.4

Activity 5 4 20 13 39 0.6 0.1–2.3

Activity 6 8 35 9 22 0.6 0.2–1.9

Activity 7 6 10 11 48 2.6 0.6–10.0

Activity 8 1 4 16 55 0.9 0.0–9.6

Activity 9 3 5 14 53 2.2 0.3–13.2

Activity 10 2 7 5 53 3.0 0.2–23.1

Frequently drinking tea at the

vocational training room 15 43 2 16 2.8 0.5–27.6

Habit of touching one's buttocks 1 0 15 38 – –

Having used the toilet outside

the facility 0 1 16 37 0.0 0.0–92.5

Meals were taken at

Table 1 3 2 12 35 4.2 0.4–56.3

Table 2 2 3 13 34 1.7 0.1–

Table 3 0 5 15 32 0.0 0.0–2.7

Table 4 2 3 13 34 1.7 0.1–16.9

Table 5 2 3 13 34 1.7 0.1–16.9

Table 6 1 4 14 33 0.6 0.0–6.8

Table 7 0 6 15 31 0.0 0.0–2.0

Table 8 1 4 14 33 0.6 0.0–6.8

Table 9 3 1 12 36 8.6 0.6–483.6

Table 10 1 3 14 34 0.8 0.0–11.2

Frequently sucking one's

fingers 4 1 12 37 11.7 1.0–620.7

Frequently loitering in the facility 1 2 15 36 1.2 0.0–24.6 Having close contacts with staff

members 1 3 15 35 0.8 0.0–10.7

Being unable to wash one's

hands 0 2 16 36 0.0 0.0–12.8

Being unable to take meals in-

dependently 0 8 16 30 0.0 0.0–1.3

Needs assistance in bathing 0 3 11 25 0.0 0.0–6.3

Needs assistance in tooth

brushing 1 5 9 23 0.5 0.0–5.7