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Volume 6, Number 1—February 2000

Dispatch

Risk Factors for Carriage of Neisseria meningitidis during an Outbreak in Wales

Patricia E. Fitzpatrick*, Roland L. Salmon*Comments to Author , Paul R. Hunter†, Richard J Roberts‡, and Stephen R. Palmer*
Author affiliations: *PHLS Communicable Disease Surveillance Centre (Wales), Cardiff, United Kingdom; †Chester Public Health Laboratory, Chester, United Kingdom; ‡North Wales Health Authority, Mold, United Kingdom

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Table 3

Risk factors for meningococcal carriage in a Welsh secondary school

Exposeda
Nonexposed
Exposed
Nonexposed
Variable Meningo-
coccal
carrier Non-
carrier Meningo-
coccal
carrier Non-
carrier Odds
ratio
(95% CI) B15
P1.16
carrier B15 P1.16
non-
carrier B15
P1.16
carrier B15 P1.16
non-
carrier Odds
ratio
(95% CI)
Year 11a 33 96 20 477 8.20b 11 118 0 497 Undefb
(4.34-15.56)
Same classes 10 42 43 530 2.93b 1 121 10 494 0.41
as index casesc (1.28-6.58) (0.02-3.13)
Smoker 21 136 32 437 2.11b 3 154 8 461 1.12
(1.12-3.94) (0.23-4.71)
Other smoker 26 202 27 371 1.77b 4 224 7 391 1.00
in household (0.99-3.24) (0.24-3.84)
Student smoker and 12 70 41 503 2.10b 2 80 9 535 1.49
other in household (1.00-4.41) (0.00-7.54)
>2 smokers in 9 37 44 535 2.96b 1 45 10 567 1.26
householdc (1.24-6.89) (0.00-12.81)
Football teamc 6 88 47 415 0.60 3 91 8 454 1.87
(0.22-1.54) (0.38-8.02)
Rugby teamc 3 29 50 466 0.96 1 31 10 506 1.63
(0.22-3.51) (0.00-13.27)
Hockey teamc 3 29 50 467 0.97 1 31 10 507 1.64
(0.22-3.52) (0.00-13.30)
Netball teamc 1 54 52 452 0.16 0 55 11 493 0.00
(0.01-1.13) (0.00-4.46)
Any sport 10 172 43 401 0.54 3 179 8 436 0.91
(0.25-1.16) (0.19-3.83)
Regular youth 21 180 32 341 1.24 3 198 8 365 0.69
clubc (0.67-2.31) (0.14-2.93)
Regular discob 30 279 23 248 1.16 4 305 7 264 0.49
(0.63-2.14) (0.12-1.92)
Attendance at 23 111 29 461 3.29b,c 8 126 3 487 10.31b
partyc (1.75-6.18) (2.42-50.34)
Cubs/brownies/ 1 42 52 531 0.24 0 43 11 572 0.00
scouts/guides (0.01-1.72) 0.00-0.00
Life event 18 146 35 427 1.50 2 162 9 453 0.62
(0.79-2.86) (0.00-3.15)
Death in familyc 4 56 49 516 0.75 0 60 11 554 0.00
(0.22-2.30) (0.00-4.58)
Change of housec 5 33 48 539 1.70 0 38 11 576 0.00
(0.55-4.89) (0.00-7.63)
Received bad 15 79 38 493 2.46* 2 92 9 522 1.26
newsc (1.22-4.91) (0.00-6.46)
Travelc 6 107 47 464 0.55 1 112 10 501 0.45
(0.21-1.40) (0.02-3.48)

aSame school year as index case.
bp < 0.05.
cData missing.

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