condition mean min max ZT0-3 861.7 861.7 861.7 ZT4-7 853.2 853.2 853.2 ZT8-11 946.1500000000001 946.1500000000001 946.1500000000001 ZT12-15 1254.5 1254.5 1254.5 ZT16-19 1401.3000000000002 1401.3000000000002 1401.3000000000002 ZT20-23 1100.55 1100.55 1100.55