condition mean min max ZT0-3 5.734697833333334 1.6202435 8.363575 ZT4-7 1.9187115580749998 1.9187115580749998 1.9187115580749998 ZT8-11 5.1362495 5.1362495 5.1362495 ZT12-15 6.079305 3.2480900000000004 8.91052 ZT16-19 3.73816 3.73816 3.73816 ZT20-23 12.21179 12.21179 12.21179