condition mean min max ZT0-3 0.18398575 0.13254950000000001 0.23542200000000002 ZT4-7 0.1975675 0.1975675 0.1975675 ZT8-11 0.4525845 0.4525845 0.4525845 ZT12-15 0 0 0 ZT16-19 0.48223299999999997 0.48223299999999997 0.48223299999999997 ZT20-23 0.366564 0.366564 0.366564