condition mean min max ZT0-3 102.172576 102.172576 102.172576 ZT4-7 431.235059 431.235059 431.235059 ZT8-11 483.4045085 483.4045085 483.4045085 ZT12-15 295.7770795 295.7770795 295.7770795 ZT16-19 201.13860549999998 201.13860549999998 201.13860549999998 ZT20-23 151.77078 151.77078 151.77078