condition mean min max ZT0-3 10.52757 8.69313 12.36201 ZT4-7 29.0565 29.0565 29.0565 ZT8-11 49.5531 49.5531 49.5531 ZT12-15 0 0 0 ZT16-19 20.891 20.891 20.891 ZT20-23 23.87565 23.87565 23.87565