condition mean min max ZT0-3 10.737375 8.8221 12.65265 ZT4-7 8.96332 8.96332 8.96332 ZT8-11 10.82468 10.82468 10.82468 ZT12-15 0 0 0 ZT16-19 8.890315000000001 8.890315000000001 8.890315000000001 ZT20-23 16.0544 16.0544 16.0544