condition mean min max ZT0-3 0.02771635 0.02771635 0.02771635 ZT4-7 0.0880253 0.0880253 0.0880253 ZT8-11 0.105103 0.105103 0.105103 ZT12-15 0.10432430000000001 0.10432430000000001 0.10432430000000001 ZT16-19 0.0459701 0.0459701 0.0459701 ZT20-23 0.0533604 0.0533604 0.0533604