condition mean min max ZT0-3 38.6 38.6 38.6 ZT4-7 49.6 49.6 49.6 ZT8-11 14.149999999999999 14.149999999999999 14.149999999999999 ZT12-15 64.55 64.55 64.55 ZT16-19 18.4 18.4 18.4 ZT20-23 55.65 55.65 55.65