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Table 1 Reproductive history among LN cases and lupus cases without nephritis stratified by current age (females only)

From: Differing environmental risk factors for membranous versus proliferative lupus nephritis

  Ages 18 to 34 (n= 127)  
Age at menarche All LN cases ( n = 64) Lupus cases without nephritis ( n = 63) OR (95% CI)
8 to 9 5 (8) 3 1.84 (0.35 to 9.62)
10 3 7 (11) 0.54 (0.11 to 2.65)
11 5 (8) 8 (13) 0.58 (0.15 to 2.29)
12 11 (17) 18 (29) 0.76 (0.27 to 2.18)
13 18 (28) 19 (30) 1.00 (referent)
14 7 (11) 4 1.54 (0.34 to 6.93)
15 9 (14) 2 4.94 (0.88 to 27.92)
16 5 (8) 2 3.57 (0.56 to 22.73)
17 to 18 1 0 -
Trend test (P value)    (0.03)
  1. Missing value (refused) for one lupus nephritis case; three lupus nephritis cases excluded because diagnosis occurred 3 to 4 years before menarche (at age 14); total n = 78.
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