condition mean min max ZT0-3 6913.450000000001 6913.450000000001 6913.450000000001 ZT4-7 5447.2 5447.2 5447.2 ZT8-11 5345.4 5345.4 5345.4 ZT12-15 5896.15 5896.15 5896.15 ZT16-19 6882.799999999999 6882.799999999999 6882.799999999999 ZT20-23 7308.5 7308.5 7308.5