condition mean min max ZT0-3 11.149999999999999 11.149999999999999 11.149999999999999 ZT4-7 8.5 8.5 8.5 ZT8-11 9.25 9.25 9.25 ZT12-15 11.0 11.0 11.0 ZT16-19 36.9 36.9 36.9 ZT20-23 20.15 20.15 20.15