condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0 0.0 0.0 ZT8-11 0.008387858 0.0 0.016775716 ZT12-15 0.0030618815000000004 0.0 0.006123763000000001 ZT16-19 0.015500116 0.0 0.031000232 ZT20-23 0.012839751000000002 0.0 0.025679502000000003