TABLE 4.

Pairwise comparison of the probability of isolating C. jejuni clonal complexes ST-61, ST-21, and ST-42 among farms and seasons

Effects by groupOR [95% CI (lower/upper)]aPP*b
UnadjustedAdjusted
Farm effects
    ST-61 complex
        Farm 3c11
        Farm 10.11 (0.04/0.33)0.08 (0.03/0.48)<0.0010.003
        Farm 20.15 (0.04/0.51)0.12 (0.02/0.48)0.0030.009
    ST-21 complex
        Farm 3c11
        Farm 11.98 (0.95/4.13)2.32 (0.93/4.20)0.075
        Farm 22.26 (0.98/5.21)2.32 (0.96/5.59)0.061
    ST-42 complex
        Farm 3c11
        Farm 19.62 (3.75/25)9.60 (3.66/25.21)<0.0010.003
        Farm 24.88 (1.66/14.29)4.45 (1.42/13.99)0.0110.033
Temporal effects (quarter)
    ST-61 complex
        Summerc11
        Autumn0.50 (0.17/1.46)0.40 (0.12/1.31)0.126
        Winter1.69 (0.52/5.46)3.48 (0.87/13.95)0.079
        Spring3.13 (1.19/8.26)5.05 (1.64/15.56)0.0050.03
  • a OR, odds ratio.

  • b P*, P values of significance adjusted for pairwise comparisons using a Bonferroni correction for three comparisons (farm effects) or six comparisons (temporal effects).

  • c Reference group.