Verified according to test case from description:
ubuntu@xenial:~$ dpkg -l | grep procps ii procps 2:3.3.10-4ubuntu2.5 amd64 /proc file system utilities
ubuntu@xenial:~$ ps -o thcount THCNT 1 1
Verified according to test case from description:
ubuntu@xenial:~$ dpkg -l | grep procps
ii procps 2:3.3.10-4ubuntu2.5 amd64 /proc file system utilities
ubuntu@xenial:~$ ps -o thcount
THCNT
1
1