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PLO)s one <br /> RESEARCH ARTIM r <br /> Use of Kaplan-Tier and Cox regressions in the <br /> distribution of length of stay in animal shelters <br /> for pre-specified calendar periods: Definition, <br /> computation, and examples of dog length of staff <br /> in orange county California <br /> Michael Lavzas MavFavounlotle k <br /> Saaal Cornpasaion and SCIL.Laguna Beath,Calirornia.Urnlled Slalea OrAinelr=a <br /> rnlrraurn7�}:rhrx::om <br /> r� Abstract <br /> l CompuRotigns pf lenglh of slay in animal shelters rely qn fixed animal whorts-This is <br /> appropriate for research studies that pre.sel shorts,but it is probtematir for oper- <br /> ational assassmants of animal shelters in fixed calendar periods or for rompansons <br /> among periods or shatters.Considering only the length of slay of animals whose <br /> i6oprNACCESS staff+ended vnthin the study period Feeds Lo mislnterpretatlon_The use of the Kaplan^ <br /> (2Wum:hl myupuniglis MI(2=)Use Maier and Cox proportional hazards methods with left-truncation and right-omsoririg <br /> or replan-Wer and Cox regras%ons In Ina is proposed to conrWly account for all animals present in the shelter for any fraction <br /> dlelrihuhc+I et I0gIh at tiley in ani nel shehers <br /> Nr pni,wodfad slender Ixrkmh:001inhior. of a study period,including those that were present at the beginning and those that <br /> mmpurauon,,.w anmplasoraagrermmor remain in care at the end of the period.Examples of dog length of stay in Orange <br /> 21e1);olar7gacaunty PIpsWfonrle OO 13 kra County Animal Care i,n California show that this computation method owea;ts the <br /> 2 it 1);eC9A2102,tr,Ips'7J'der Qrg'10 1771,1 <br /> purnal.pOne0342142 misleading view of hislorirally used calculations of Length of stay. Statist ically Sig- <br /> Edaw-cmhavargk unimmmy or Ilneais nificant changes in length of stay are observed in 8 out of 23 quarterly periods,In a <br /> Uriene-thwnpalgnCaaega ar Veterinary compan5cin of length or stay before and after the CWE)-19 pandemic,the observed <br /> Medtcdnu.UNITED STATES OF AIVIEWA significant change in length of stay cannot t'e explainer)by variations in sizes and <br /> Iks9Yrvill,I 113,2025 o9e5 pf incoming dogs and may toe connected to 4perativrwl p91ioieg lhet restricted <br /> AccVad..knuery 17.2M visitor a ess.The proposed approach enables timely traainrg of length of Stay, <br /> P.hlrrradrimuery3G,2026 uro*oornparlws,and as"ssrtrsnt of shaper preGicim and mscuirce neg[!5_ <br /> Capyrtlft 026M Manse]Laws <br /> Mawvmtr*is,This isan®panacsm article <br /> dielrihuledundattlrrelewtof ft Cre2on 1 Introduction <br /> r,omrnans AN.ntnlppn Llaeerse,which parrots <br /> uaraslnascl usa diarfttion,nrd reproduction The concept of Lenglh of Slay(LOS)in animal shelters.is critical for managing shel- <br /> in airy medium,pnwided dreurginal aulriar ker capacity,imprvving animal welfare,arid sss slang and irriproving she.tter perfor- <br /> and sawae are arealad. mania. For an individual animal,the length of stay measura s haw much lima the <br /> Data axellhhlllL r I MM&M!The dale end anlrnal Is under the shalter's care,from Intake to outcome[1). Intake and outcome <br /> nlherscpiamnq dwArnentr,abla'red undw data from anirnaI shelters for animal cohorts of interest can be summarized into LOS <br /> IFc Cald'nrnia Public Rmorils Ad hzm bow <br /> PL08 Oa9 I l[I,psJh]au�r�}rii~.1371�)orrna=,t7nne.03421i72 Atnaaly W,2026 1 r 21 <br /> 3 <br />