condition mean min max ZT0-3 1.2490700000000001 1.2490700000000001 1.2490700000000001 ZT4-7 1.183213 1.183213 1.183213 ZT8-11 1.0203875 1.0203875 1.0203875 ZT12-15 1.3518 1.3518 1.3518 ZT16-19 1.34016 1.34016 1.34016 ZT20-23 1.299575 1.299575 1.299575