condition mean min max ZT0-3 26.9737 22.39155 31.55585 ZT4-7 22.4391 22.4391 22.4391 ZT8-11 1.8992049999999998 1.8992049999999998 1.8992049999999998 ZT12-15 0 0 0 ZT16-19 5.583875000000001 5.583875000000001 5.583875000000001 ZT20-23 20.1372 20.1372 20.1372