condition mean min max ZT0-3 9.25852 9.25852 9.25852 ZT4-7 8.494395 8.494395 8.494395 ZT8-11 7.017564999999999 7.017564999999999 7.017564999999999 ZT12-15 8.61846 8.61846 8.61846 ZT16-19 9.35494 9.35494 9.35494 ZT20-23 9.46724 9.46724 9.46724