condition mean min max ZT0-3 0.3296896225 0.0 0.659379245 ZT4-7 1.0724871332500001 0.7489370725 1.396037194 ZT8-11 1.250600044 1.019668818 1.48153127 ZT12-15 2.56285112675 1.4600724729999999 3.6656297804999998 ZT16-19 6.40083566025 5.4634129695 7.338258351 ZT20-23 8.03158732675 7.552974402 8.5102002515