condition mean min max ZT0-3 6677.648888 6677.648888 6677.648888 ZT4-7 3885.105 3885.105 3885.105 ZT8-11 3970.818889 3970.818889 3970.818889 ZT12-15 18103.063334333332 18103.063334333332 18103.063334333332 ZT16-19 31609.480000000003 31609.480000000003 31609.480000000003 ZT20-23 18056.325556666667 18056.325556666667 18056.325556666667