condition mean min max ZT0-3 10.32657 10.32657 10.32657 ZT4-7 6.283015 6.283015 6.283015 ZT8-11 5.20955 5.20955 5.20955 ZT12-15 7.868465 7.868465 7.868465 ZT16-19 17.216250000000002 17.216250000000002 17.216250000000002 ZT20-23 11.05645 11.05645 11.05645