condition mean min max ZT0-3 9.368883 9.368883 9.368883 ZT4-7 10.264679000000001 10.264679000000001 10.264679000000001 ZT8-11 10.704649 10.704649 10.704649 ZT12-15 9.5765885 9.5765885 9.5765885 ZT16-19 10.3734975 10.3734975 10.3734975 ZT20-23 11.150817 11.150817 11.150817