condition mean min max ZT0-3 14.552 14.552 14.552 ZT4-7 8.94824 8.94824 8.94824 ZT8-11 7.769525 7.769525 7.769525 ZT12-15 20.2744 20.2744 20.2744 ZT16-19 24.9212 24.9212 24.9212 ZT20-23 20.17755 20.17755 20.17755