condition mean min max ZT0-3 5.896207500000001 5.408855000000001 6.383560000000001 ZT4-7 5.043265 5.043265 5.043265 ZT8-11 7.345695 7.345695 7.345695 ZT12-15 0 0 0 ZT16-19 11.2255 11.2255 11.2255 ZT20-23 8.30955 8.30955 8.30955