condition mean min max ZT0-3 74.7 74.7 74.7 ZT4-7 75.2 75.2 75.2 ZT8-11 59.5 59.5 59.5 ZT12-15 72.2 72.2 72.2 ZT16-19 66.55000000000001 66.55000000000001 66.55000000000001 ZT20-23 61.3 61.3 61.3