condition mean min max ZT0-3 100.472192 100.472192 100.472192 ZT4-7 52.836919 52.836919 52.836919 ZT8-11 25.467098500000002 25.467098500000002 25.467098500000002 ZT12-15 61.151323999999995 61.151323999999995 61.151323999999995 ZT16-19 106.1097745 106.1097745 106.1097745 ZT20-23 260.5229745 260.5229745 260.5229745