condition mean min max ZT0-3 28.556292 28.556292 28.556292 ZT4-7 29.344655000000003 29.344655000000003 29.344655000000003 ZT8-11 36.8045855 36.8045855 36.8045855 ZT12-15 32.787239 32.787239 32.787239 ZT16-19 26.4884345 26.4884345 26.4884345 ZT20-23 24.964592 24.964592 24.964592