condition mean min max ZT0-3 1.05641925 0.943974 1.1688645 ZT4-7 0.8219069999999999 0.8219069999999999 0.8219069999999999 ZT8-11 0.34491099999999997 0.34491099999999997 0.34491099999999997 ZT12-15 0 0 0 ZT16-19 0.6385590000000001 0.6385590000000001 0.6385590000000001 ZT20-23 0.7272625 0.7272625 0.7272625