condition mean min max ZT0-3 5.6117882025 3.265926646 7.957649759 ZT4-7 11.59750207625 10.3909237875 12.804080365 ZT8-11 9.8015099245 9.6747983975 9.928221451499999 ZT12-15 6.28355287425 5.6093240555 6.957781692999999 ZT16-19 4.3859333675 4.166087512 4.605779223000001 ZT20-23 4.3535878839999995 3.815241737 4.891934031