Table 2 Treatment group minimum inhibitory concentration ratio (MR) estimates for Enterococcus spp. accelerated failure time models (zinc vs placebo).

From: Impact of zinc supplementation on phenotypic antimicrobial resistance of fecal commensal bacteria from pre-weaned dairy calves

Model

Coefficient (SE)

MIC ratio, MR (SE)

p-value

95% CI

SYN (quinupristin/dalfopristin)a

0.13 (0.13)

1.14 (0.15)

0.340

0.88, 1.47

CIP (ciprofloxacin)b

0.024 (0.10)

1.02 (0.10)

0.809

0.84, 1.25

LZD (linezolid)c

0.13 (0.076)

1.14 (0.087)

0.079

0.98, 1.33

NIT (nitrofurantoin)a

0.23 (0.25)

1.26 (0.32)

0.354

0.77, 2.06

ERY (erythromycin)b

0.90 (1.02)

2.46 (2.52)

0.379

0.33, 18.29

TYLT (tylosin tartrate)b

1.08 (1.01)

2.94 (2.99)

0.288

0.40, 21.50

DAP (daptomycin)a

0.15 (0.12)

1.16 (0.14)

0.216

0.92, 1.46

TGC (tigecycline)b

0.055 (0.076)

1.06 (0.081)

0.468

0.91, 1.23

VAN (vancomycin)a

− 0.039 (0.099)

0.96 (0.095)

0.694

0.79, 1.17

CHL (chloramphenicol)b

0.072 (0.065)

1.07 (0.07)

0.270

0.95, 1.22

PEN (penicillin)a

0.0061 (0.21)

1.01 (0.21)

0.977

0.67, 1.52

GEN (gentamicin)d

0.37 (0.35)

1.44 (0.51)

0.295

0.73, 2.88

STR (streptomycin)a

0.20 (0.85)

1.22 (1.03)

0.816

0.23, 6.42

  1. aModel adjusted for age of calf in days and binary spectinomycin treatment variable (received or not).
  2. bModel adjusted for age of calf in days and days from last spectinomycin treatment.
  3. cModel adjusted for age of calf in days and categorical days from last spectinomycin treatment (0 days, 1–3 days, 4–7 days, and 8–23 days).
  4. dModel adjusted for categorical age of calf by week (5–7 days, 8–14 days, 15–21 days, 23–28 days, 29–35 days), and days from last spectinomycin treatment.
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