condition mean min max ZT0-3 47.594275 43.03425 52.154300000000006 ZT4-7 33.1582 33.1582 33.1582 ZT8-11 23.53585 23.53585 23.53585 ZT12-15 0 0 0 ZT16-19 31.749450000000003 31.749450000000003 31.749450000000003 ZT20-23 33.14475 33.14475 33.14475