condition mean min max ZT0-3 16.68565 16.68565 16.68565 ZT4-7 11.804950000000002 11.804950000000002 11.804950000000002 ZT8-11 13.097000000000001 13.097000000000001 13.097000000000001 ZT12-15 16.27175 16.27175 16.27175 ZT16-19 17.893050000000002 17.893050000000002 17.893050000000002 ZT20-23 16.42375 16.42375 16.42375