condition mean min max ZT0-3 0.5843700000000001 0.5843700000000001 0.5843700000000001 ZT4-7 0.274257 0.274257 0.274257 ZT8-11 0.2320465 0.2320465 0.2320465 ZT12-15 0.6876365 0.6876365 0.6876365 ZT16-19 0.564353 0.564353 0.564353 ZT20-23 0.607425 0.607425 0.607425