condition mean min max ZT0-3 11.65 11.65 11.65 ZT4-7 9.1 9.1 9.1 ZT8-11 10.1 10.1 10.1 ZT12-15 7.4 7.4 7.4 ZT16-19 27.299999999999997 27.299999999999997 27.299999999999997 ZT20-23 5.949999999999999 5.949999999999999 5.949999999999999