condition mean min max ZT0-3 203.634122 203.634122 203.634122 ZT4-7 217.3298255 217.3298255 217.3298255 ZT8-11 212.881283 212.881283 212.881283 ZT12-15 227.252066 227.252066 227.252066 ZT16-19 256.2388345 256.2388345 256.2388345 ZT20-23 283.024361 283.024361 283.024361