condition mean min max ZT0-3 3.6075449999999996 2.59464 4.201309999999999 ZT4-7 3.001305 3.001305 3.001305 ZT8-11 2.6034800000000002 2.6034800000000002 2.6034800000000002 ZT12-15 3.6383324999999997 3.156305 4.12036 ZT16-19 3.4181549999999996 3.4181549999999996 3.4181549999999996 ZT20-23 5.3161 5.3161 5.3161