condition mean min max ZT0-3 2.11992 2.11992 2.11992 ZT4-7 2.769835 2.769835 2.769835 ZT8-11 2.84991 2.84991 2.84991 ZT12-15 3.9358949999999995 3.9358949999999995 3.9358949999999995 ZT16-19 4.55185 4.55185 4.55185 ZT20-23 4.55869 4.55869 4.55869