condition mean min max ZT0-3 12.115749999999998 12.115749999999998 12.115749999999998 ZT4-7 6.4646349999999995 6.4646349999999995 6.4646349999999995 ZT8-11 5.47757 5.47757 5.47757 ZT12-15 10.11434 10.11434 10.11434 ZT16-19 13.84745 13.84745 13.84745 ZT20-23 12.93995 12.93995 12.93995