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Table 3 Crude likelihood ratios for meningitis of items of clinical examination amongst neonates and young infants in the derivation period.

From: Clinical indicators of bacterial meningitis among neonates and young infants in rural Kenya

    First week of life   Age 7 to 59 days
  Sample size   Without meningitis With meningitis Crude LR Sample size Without meningitis With meningitis Crude LR
Neck stiffness 1,031 No 995 31 1.01 1,380 1,285 60 0.92
   Yes 5 0 -   28 7 4.90
Bulging fontanel 1,031 No 990 26 0.85 1,380 1,300 56 0.84
   Yes 10 5 16.13   13 11 16.58
Abnormal cry or none 1031 No 949 30 1.02 1,380 1,287 65 0.99
   Yes 51 1 0.63   26 2 1.51
Irritability 1031 No 988 29 0.95 1,380 1,267 57 0.88
   Yes 12 2 5.38   46 10 4.26
Spontaneous movements 1,031 No 27 0 - 1,390 13 3 4.52
   Yes 973 31 1.07   1,300 64 0.97
Drowsy, lethargic or unconscious 1,031 No 782 21 0.87 1,380 1,153 51 0.87
   Yes 218 10 1.48   160 16 1.96
Capillary refill seconds 1,031 < 3 866 30 1.12 1,380 1,234 63 1.00
   ≥ 3 134 1 0.24   79 4 0.99
Weight(kg) 1,029 < 1.5 115 0 - 1,370 36 0 -
   1.5-1.99 127 3 0.76   96 8 1.62
   2-2.49 195 6 0.99   152 12 1.54
   ≥ 2.5 561 22 1.26   1,019 47 0.90
Axillary temperature °C 1,031 < 36 248 7 0.91 1,380 82 3 0.72
   36-37.4 546 8 0.47   752 24 0.63
   37.5-38.9 188 12 2.06   397 24 1.19
   ≥ 39 18 4 7.17   82 16 3.82