condition mean min max ZT0-3 0.48229350000000004 0.4347705 0.5298165 ZT4-7 0.7959505 0.7959505 0.7959505 ZT8-11 0.527489 0.527489 0.527489 ZT12-15 0 0 0 ZT16-19 1.3014235 1.3014235 1.3014235 ZT20-23 1.219749 1.219749 1.219749