condition mean min max ZT0-3 75.310768 75.310768 75.310768 ZT4-7 91.968855 91.968855 91.968855 ZT8-11 65.100274 65.100274 65.100274 ZT12-15 56.261413000000005 56.261413000000005 56.261413000000005 ZT16-19 41.4111955 41.4111955 41.4111955 ZT20-23 33.389129 33.389129 33.389129