Table 3

Geometric Mean Titre (GMT) and factor increases after influenza A (H1N1) 2009 vaccination in ARD patients and controls

GMT
Before immunisationAfter immunisation
NValue (95% CI)Factor increase in GMT
ARD16688.0 (7.7 to 8.4)*71.5 (66.2 to 77.3)*8.9 (8.3 to 9.6)*
SLE5727.5 (7.0 to 8.0)*59.2 (51.9 to 67.4)*7.9 (7.0 to 8.9)*
RA3438.0 (7.3 to 8.8)57.7 (48.1 to 69.1)*7.2 (6.1 to 8.5)*
PsA1018.5 (7.1 to 10.1)56.0 (40.2 to 77.9)*6.6 (4.9 to 8.9)*
AS1527.9 (6.9 to 8.9)80.0 (62.8 to 101.9)*10.2 (8.1 to 12.8)
BD857.2 (6.0 to 8.6)95.7 (68.2 to 134.3)13.4 (9.8 to 18.2)
DM457.5 (6.0 to 9.2)83.8 (48.3 to 145.5)11.2 (6.8 to 18.6)
SSc12711.2 (9.2 to 13.7)134.4 (101.4 to 178)12.0 (9.1 to 15.8)
MCTD698.3 (6.8 to 10.3)83.3 (59.0 to 117.6)10.0 (7.0 to 14.2)
PAPS546.5 (5.5 to 7.5)83.4 (57.8 to 120.4)12.9 (9.0 to 18.6)
pSS368.9 (6.4 to 12.4)95.1 (59.4 to 152.3)10.7 (6.6 to 17.2)
TA308.5 (6.1 to 11.8)179.6 (102.1 to 316.0)21.1 (11.7 to 38.1)
PM2811.3 (7.6 to 16.9)148.5 (86.2 to 256)13.1 (7.9 to 21.9)
WG269.2 (5.9 to 14.4)73.9 (42.1 to 129.5)8 (5.0 to 12.7)
Control2349.3 (8.2 to 10.5)122.9 (103.4 to 146.1)13.2 (11.1 to 15.8)
  • Data are expressed in value (95% CI).

  • * p<0.05.

  • ARD, autoimmune rheumatic diseases; AS, ankylosing spondylitis; BD, Behçet's disease; DM, dermatomyositis; GMT, geometric mean titre; MCTD, mixed connective tissue disease; PAPS, primary antiphospholipid syndrome; PM, polymyositis; PsA, psoriatic arthritis; pSS, primary Sjögren's syndrome; RA, rheumatoid arthritis; SLE, systemic lupus erythematosus; SSc, systemic sclerosis; TA, Takayasu's arteritis; WG, Wegener's granulomatosis.