condition mean min max ZT0-3 0.6281957499999999 0.594587 0.6618044999999999 ZT4-7 0.936849 0.936849 0.936849 ZT8-11 1.22378 1.22378 1.22378 ZT12-15 0 0 0 ZT16-19 1.12788 1.12788 1.12788 ZT20-23 1.002532 1.002532 1.002532