condition mean min max ZT0-3 9.103974 9.103974 9.103974 ZT4-7 9.707831 9.707831 9.707831 ZT8-11 10.250852 10.250852 10.250852 ZT12-15 10.724161500000001 10.724161500000001 10.724161500000001 ZT16-19 9.694224 9.694224 9.694224 ZT20-23 9.366783 9.366783 9.366783