condition mean min max ZT0-3 0.465552 0.465552 0.465552 ZT4-7 0.555304 0.555304 0.555304 ZT8-11 1.72508 1.72508 1.72508 ZT12-15 0.932124 0.932124 0.932124 ZT16-19 0.403205 0.403205 0.403205 ZT20-23 0.861727 0.861727 0.861727