condition mean min max ZT0-3 11.299762 11.299762 11.299762 ZT4-7 10.473389000000001 10.473389000000001 10.473389000000001 ZT8-11 10.198014 10.198014 10.198014 ZT12-15 10.081287 10.081287 10.081287 ZT16-19 9.6936405 9.6936405 9.6936405 ZT20-23 8.7300885 8.7300885 8.7300885