condition mean min max ZT0-3 0.5353665000000001 0.5353665000000001 0.5353665000000001 ZT4-7 0.533092 0.533092 0.533092 ZT8-11 0.497684 0.497684 0.497684 ZT12-15 1.2994780000000001 1.2994780000000001 1.2994780000000001 ZT16-19 1.3663625 1.3663625 1.3663625 ZT20-23 0.7544605 0.7544605 0.7544605