condition mean min max ZT0-3 0.429359 0.429359 0.429359 ZT4-7 0.3035945 0.3035945 0.3035945 ZT8-11 0.706603 0.706603 0.706603 ZT12-15 0.32018365 0.32018365 0.32018365 ZT16-19 0.586905 0.586905 0.586905 ZT20-23 0.5308245 0.5308245 0.5308245