condition mean min max ZT0-3 8.53603 8.53603 8.53603 ZT4-7 8.12982 8.12982 8.12982 ZT8-11 7.719144999999999 7.719144999999999 7.719144999999999 ZT12-15 11.84319 11.84319 11.84319 ZT16-19 15.38285 15.38285 15.38285 ZT20-23 8.50078 8.50078 8.50078