condition mean min max ZT0-3 972.862319 972.862319 972.862319 ZT4-7 968.7172785 968.7172785 968.7172785 ZT8-11 473.92843400000004 473.92843400000004 473.92843400000004 ZT12-15 281.7319175 281.7319175 281.7319175 ZT16-19 99.769829 99.769829 99.769829 ZT20-23 146.1980545 146.1980545 146.1980545