condition mean min max ZT0-3 14.895083333333332 14.8603 14.934249999999999 ZT4-7 12.19735 12.19735 12.19735 ZT8-11 6.448454999999999 6.448454999999999 6.448454999999999 ZT12-15 12.154824999999999 10.7568 13.55285 ZT16-19 13.700800000000001 13.700800000000001 13.700800000000001 ZT20-23 13.2153 13.2153 13.2153