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Table 3 Characterisation of complement levels (n = 1140)

From: The association of low complement with disease activity in systemic sclerosis: a prospective cohort study

Parameter

n (%) or mean ± SD or median (25th–75th IQR)

Hypocomplementaemiaa

 At recruitment

150 (13.2 %)

 Everb

275 (24.1 %)

Number of complement measurements per patient

2 (1–3)

 1

400 (35.1 %)

 2

265 (23.3 %)

 3

196 (17.2 %)

 4

129 (11.3 %)

 5

85 (7.5 %)

 6

50 (4.4 %)

 7

14 (1.2 %)

 8

1 (0.1 %)

Total number of complement measurements in data set

1893

Time interval between complement measurements, years

1.2 ± 0.4

  1. aA low C3 and/or C4 result
  2. bAt least one episode of hypocomplementaemia over the study period