Table 4 Incidence rates and ratios for total opportunistic infections and non-herpes zoster infections according to systemic rheumatic disease and follow-up duration

 0–1

2.76 (2.53–2.99)

2.86 (2.48–3.31)

 1–2

1.41 (1.27–1.57)

1.30 (1.07–1.58)

 2–3

1.24 (1.10–1.38)

1.10 (0.89–1.36)

 3–4

1.20 (1.06–1.36)

1.05 (0.84–1.31)

 4–5

1.15 (1.01–1.31)

1.09 (0.86–1.38)

 > 5

1 (reference)

1 (reference)

 Total

–

–

 0–1

1.32 (1.23–1.43)

1.44 (1.25–1.66)

 1–2

1.09 (1.01–1.18)

1.10 (0.94–1.29)

 2–3

1.01 (0.92–1.10)

1.11 (0.94–1.31)

 3–4

1.01 (0.91–1.10)

1.03 (0.86–1.22)

 4–5

1.05 (0.95–1.15)

1.20 (1.01–1.43)

 > 5

1 (reference)

1 (reference)

 Total

–

–

 0–1

1.54 (1.36–1.75)

1.85 (1.44–2.37)

 1–2

1.25 (1.08–1.43)

1.04 (0.76–1.41)

 2–3

1.03 (0.88–1.20)

0.87 (0.61–1.22)

 3–4

1.01 (0.85–1.20)

1.01 (0.71–1.43)

 4–5

1.15 (0.97–1.37)

1.14 (0.78–1.62)

 > 5

1 (reference)

1 (reference)

 Total

–

–

 0–1

1.61 (1.18–2.18)

1.68 (1.04–2.72)

 1–2

1.34 (0.95–1.88)

1.04 (0.56–1.86)

 2–3

1.26 (0.87–1.80)

1.08 (0.56–1.96)

 3–4

1.27 (0.86–1.85)

0.86 (0.40–1.71)

 4–5

0.70 (0.40–1.15)

0.63 (0.24–1.43)

 > 5

1 (reference)

1 (reference)

 Total

–

–

 0–1

5.47 (4.31–6.98)

11.2 (7.14–18.2)

 1–2

2.46 (1.84–3.29)

3.66 (2.11–6.46)

 2–3

2.27 (1.66–3.09)

2.76 (1.48–5.15)

 3–4

1.42 (0.96–2.06)

2.37 (1.19–4.64)

 4–5

1.40 (0.92–2.07)

2.40 (1.17–4.81)

 > 5

1 (reference)

1 (reference)

 Total

–

–