condition mean min max ZT0-3 2167.5 2167.5 2167.5 ZT4-7 5106.6 5106.6 5106.6 ZT8-11 4090.3999999999996 4090.3999999999996 4090.3999999999996 ZT12-15 3863.4 3863.4 3863.4 ZT16-19 2814.35 2814.35 2814.35 ZT20-23 2266.5 2266.5 2266.5