condition mean min max ZT0-3 60.31704 60.31704 60.31704 ZT4-7 68.1158905 68.1158905 68.1158905 ZT8-11 62.67129250000001 62.67129250000001 62.67129250000001 ZT12-15 69.366927 69.366927 69.366927 ZT16-19 89.334892 89.334892 89.334892 ZT20-23 86.7951485 86.7951485 86.7951485