condition mean min max ZT0-3 35.5372 35.5372 35.5372 ZT4-7 29.401049999999998 29.401049999999998 29.401049999999998 ZT8-11 24.36335 24.36335 24.36335 ZT12-15 24.913899999999998 24.913899999999998 24.913899999999998 ZT16-19 30.1253 30.1253 30.1253 ZT20-23 30.6705 30.6705 30.6705