condition mean min max ZT0-3 40.523025000000004 39.6421 41.40395 ZT4-7 29.758499999999998 29.758499999999998 29.758499999999998 ZT8-11 84.475 84.475 84.475 ZT12-15 0 0 0 ZT16-19 65.3572 65.3572 65.3572 ZT20-23 46.74745 46.74745 46.74745