condition mean min max ZT0-3 31.210348 31.210348 31.210348 ZT4-7 33.326043 33.326043 33.326043 ZT8-11 29.629582 29.629582 29.629582 ZT12-15 26.7309205 26.7309205 26.7309205 ZT16-19 28.434027999999998 28.434027999999998 28.434027999999998 ZT20-23 32.740857500000004 32.740857500000004 32.740857500000004