condition mean min max ZT0-3 21.25265 21.25265 21.25265 ZT4-7 15.8184 15.8184 15.8184 ZT8-11 17.337600000000002 17.337600000000002 17.337600000000002 ZT12-15 17.13225 17.13225 17.13225 ZT16-19 24.01555 24.01555 24.01555 ZT20-23 23.042099999999998 23.042099999999998 23.042099999999998