condition mean min max ZT0-3 16.058125 14.95185 17.1644 ZT4-7 16.1174 16.1174 16.1174 ZT8-11 24.828249999999997 24.828249999999997 24.828249999999997 ZT12-15 0 0 0 ZT16-19 19.0492 19.0492 19.0492 ZT20-23 15.78355 15.78355 15.78355