condition mean min max ZT0-3 24.15 24.15 24.15 ZT4-7 5.8 5.8 5.8 ZT8-11 7.75 7.75 7.75 ZT12-15 46.1 46.1 46.1 ZT16-19 11.149999999999999 11.149999999999999 11.149999999999999 ZT20-23 14.899999999999999 14.899999999999999 14.899999999999999