condition mean min max ZT0-3 0.49194675 0.481663 0.5022305 ZT4-7 0.5675275 0.5675275 0.5675275 ZT8-11 0.39552499999999996 0.39552499999999996 0.39552499999999996 ZT12-15 0 0 0 ZT16-19 0.473322 0.473322 0.473322 ZT20-23 0.5056875 0.5056875 0.5056875