condition mean min max ZT0-3 0.344393 0.24942949999999997 0.43935650000000004 ZT4-7 0.182985 0.182985 0.182985 ZT8-11 0.2511575 0.2511575 0.2511575 ZT12-15 0 0 0 ZT16-19 0.621939 0.621939 0.621939 ZT20-23 0.6732975000000001 0.6732975000000001 0.6732975000000001