condition mean min max ZT0-3 19.3156 19.3156 19.3156 ZT4-7 11.5678 11.5678 11.5678 ZT8-11 12.30425 12.30425 12.30425 ZT12-15 22.59985 22.59985 22.59985 ZT16-19 23.74745 23.74745 23.74745 ZT20-23 22.1343 22.1343 22.1343