condition mean min max ZT0-3 14.579856666666666 9.336870000000001 17.77975 ZT4-7 7.24688 7.24688 7.24688 ZT8-11 7.623715 7.623715 7.623715 ZT12-15 10.6842875 8.918775 12.4498 ZT16-19 12.0608 12.0608 12.0608 ZT20-23 17.073500000000003 17.073500000000003 17.073500000000003