Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Least square means ± SE for the time in seconds kittens (n = 6) spent scratching each scratcher when S-shaped cardboard (S-cardboard) and scratcher covered with window screen laid down, S-cardboard and scratcher covered with short-fiber carpet laid down (carpet short down), and S-cardboard and scratcher covered with long-fiber carpet laid down (carpet long down) were compared. *P <0.05 according to the Wilcoxon signed rank test
