condition mean min max ZT0-3 11.9481675 11.831949999999999 12.064385 ZT4-7 22.772 22.772 22.772 ZT8-11 27.9169 27.9169 27.9169 ZT12-15 0 0 0 ZT16-19 23.98675 23.98675 23.98675 ZT20-23 16.84935 16.84935 16.84935