condition mean min max ZT0-3 0.284944 0.239493 0.330395 ZT4-7 0.330602 0.330602 0.330602 ZT8-11 0.24509999999999998 0.24509999999999998 0.24509999999999998 ZT12-15 0 0 0 ZT16-19 0.495888 0.495888 0.495888 ZT20-23 0.361043 0.361043 0.361043