condition mean min max ZT0-3 13.832425 12.2132 15.45165 ZT4-7 10.08239 10.08239 10.08239 ZT8-11 9.20542 9.20542 9.20542 ZT12-15 0 0 0 ZT16-19 11.978200000000001 11.978200000000001 11.978200000000001 ZT20-23 12.924949999999999 12.924949999999999 12.924949999999999