condition mean min max ZT0-3 71.851096 71.851096 71.851096 ZT4-7 76.3511 76.3511 76.3511 ZT8-11 71.4667435 71.4667435 71.4667435 ZT12-15 62.659332500000005 62.659332500000005 62.659332500000005 ZT16-19 65.2094585 65.2094585 65.2094585 ZT20-23 61.87801 61.87801 61.87801