Table 2 Characteristics of the NH personnel and their seasonal IV coverage

 Sex

  Male

[10.0–17.0]

[15.4–36.7]

  Female

[83.2–90.0]

[14.5–25.7]

 Mean age

  Age: 20–29 yrs

[14.2–22.2]

[3.6–13.0]

ref.

–

  Age: 30–39 yrs

[24.2–33.5]

[15.0–30.1]

2.95

[1.51–5.76]

0.003

  Age: 40–49 yrs

[25.9–33.6]

[18.0–36.6]

3.45

[1.86–6.41]

<0.001

  Age: 50–59 yrs

[17.0–25.4]

[12.2–31.9]

2.81

[1.28–6.16]

0.012

  Age: 60–69 yrs

[1.9–5.1]

[11.8–49.9]

2.91

[1.02–8.34]

0.043

 Mean institution working length

  Working length: 0–5 yrs

[21.1–32.1]

[7.6–27.8]

  Working length: 5–10 yrs

[26.6–37.2]

[8.3–27.8]

  Working length: 10–15 yrs

[15.4–22.4]

[18.3–38.6]

  Working length: 15–20 yrs

[11.1–19.0]

[13.4–33.5]

  Working length: >20 yrs

[6.5–12.1]

[13.7–41.2]

 Occupation classification

  Healthcare workers

[37.7–48.2]

[18.4–32.6]

ref.

–

  Administrative

[8.5–14.1]

[18.5–47.0]

1.07

[0.74–1.55]

0.86

  Facilities and logistics

[31.0–40.6]

[8.3–20.2]

0.53

[0.36–0.77]

0.003

  Other

[7.8–14.1]

[6.7–27.7]

0.49

[0.25–0.98]

0.045

 Frequency of contacts with residents

  Rarely (<=1/day)

[12.2–20.6]

[11.1–34.5]

  Several times/day (>1/day)

[79.4–87.8]

[15.3–25.9]

 Living with children <5 yrs

[18.9–27.7]

[14.0–32.1]

 Living with elderly person >65 yrs

[2.7–7.1]

[7.6–40.2]

 Living with someone with chronic illness

[6.0–11.3]

[18.4–46.4]

 Living with someone with influenza risk factor (total)

[27.3–36.3]

[17.5–34.9]

 Having a personal medical indication to vaccination

[7.3–12.5]

[14.9–42.6]

 Previous “severe” influenza infection

[35.8–42.5]

[19.8–37.3]

1.48

[1.01–2.17]

0.045