condition mean min max ZT0-3 10.1828775 9.400105 10.96565 ZT4-7 9.5548 9.5548 9.5548 ZT8-11 8.008904999999999 8.008904999999999 8.008904999999999 ZT12-15 0 0 0 ZT16-19 11.19145 11.19145 11.19145 ZT20-23 10.869050000000001 10.869050000000001 10.869050000000001