condition mean min max ZT0-3 21.295611666666666 9.682635000000001 28.041400000000003 ZT4-7 8.179805 8.179805 8.179805 ZT8-11 8.013655 8.013655 8.013655 ZT12-15 12.18109 9.60193 14.76025 ZT16-19 11.362635000000001 11.362635000000001 11.362635000000001 ZT20-23 21.04505 21.04505 21.04505