condition mean min max ZT0-3 160.445031 160.445031 160.445031 ZT4-7 200.679765 200.679765 200.679765 ZT8-11 197.518314 197.518314 197.518314 ZT12-15 206.16535149999999 206.16535149999999 206.16535149999999 ZT16-19 251.8690525 251.8690525 251.8690525 ZT20-23 239.914171 239.914171 239.914171