condition mean min max ZT0-3 0.3654333333333333 0.105498 0.6937249999999999 ZT4-7 0.095478 0.095478 0.095478 ZT8-11 0.387069 0.387069 0.387069 ZT12-15 0.35845425 0.193482 0.5234265 ZT16-19 0.368092 0.368092 0.368092 ZT20-23 0.31330800000000003 0.31330800000000003 0.31330800000000003