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Table 4 Analgesic effectiveness and dosage rates stratified by base coat colour. Chi-squared p-value = 0.023

From: Preliminary investigation of potential links between pigmentation variants and opioid analgesic effectiveness in horses during cerebrospinal fluid centesis

Coat colour phenotype

Mean analgesic effectiveness

Median analgesic effectiveness

Mean dosage rate (mg/kg BW)

Median dosage rate (mg/kg BW)

Bay (n = 29)

2.7

3

0.014

0.015

Chestnut (n = 18)

2.1

2

0.02

0.02