condition mean min max ZT0-3 52.140600000000006 51.542550000000006 52.73865 ZT4-7 49.2355 49.2355 49.2355 ZT8-11 52.8334 52.8334 52.8334 ZT12-15 0 0 0 ZT16-19 54.35045 54.35045 54.35045 ZT20-23 59.13225 59.13225 59.13225