condition mean min max ZT0-3 73.92028333333333 71.3167 76.58795 ZT4-7 77.70315 77.70315 77.70315 ZT8-11 84.394 84.394 84.394 ZT12-15 86.647475 81.06965 92.2253 ZT16-19 76.03720000000001 76.03720000000001 76.03720000000001 ZT20-23 76.24665 76.24665 76.24665