condition mean min max ZT0-3 8.33135 8.33135 8.33135 ZT4-7 9.495999000000001 9.495999000000001 9.495999000000001 ZT8-11 9.565878999999999 9.565878999999999 9.565878999999999 ZT12-15 9.353536 9.353536 9.353536 ZT16-19 9.113491499999999 9.113491499999999 9.113491499999999 ZT20-23 10.2655645 10.2655645 10.2655645