condition mean min max ZT0-3 201.225346 201.225346 201.225346 ZT4-7 101.079156 101.079156 101.079156 ZT8-11 62.1355095 62.1355095 62.1355095 ZT12-15 84.1011525 84.1011525 84.1011525 ZT16-19 63.536939 63.536939 63.536939 ZT20-23 81.12598 81.12598 81.12598