Table 2B.

Univariable “chemical” factors associations with ischaemic teat necrosis (ITN) as the outcome variable.

Variable (coding)	ITN + farms	ITN – farms	Odds ratio (lci-uci)	p-value
Use of an automated dipping and flushing (ADF) system n = 213
Don't use ADF (0)	74 (34.7%)	82 (38.5%)	*	-
Do use ADF (1)	37 (17.4%)	20 (9.4%)	2.05 (1.09–3.84)	0.03
Disinfection of clustered between cows n = 208
Don't disinfect clusters (0)	25 (12.0%)	47 (22.6%)	*	-
Disinfect clusters between every cow (1)	38 (18.3%)	29 (13.9%)	2.46 (1.24–4.89)	0.01
Disinfect cluster if mastitis/high SCC (2)	41 (19.7%)	28 (13.5%)	2.75 (1.39–5.45)	<0.01

The table shows the number of farms reporting each variable along with the proportion of farms in each ITN status (positive if they have cases of ITN, negative if they do not report cases of ITN), the odd's ratio and the p-value of the association of the variable to the ITN status. The number of farmers responding to each question varied with the number of farmers that answered (n). The numbers within the parenthesis next to each variable indicates the code used within the statistical models. The number of farms with or without the variable in question was recorded alongside the ITN status (±) with the percentage indicated in parenthesis. Odds ratio is indicated along with the Wald method of calculating the lower confidence interval (lci) and the upper confidence interval (uci). Variables with p > 0.05 are included as Supplementary Table 3.

^*Indicates the reference group used for each variable.