condition mean min max ZT0-3 16.87095 16.87095 16.87095 ZT4-7 10.227395 10.227395 10.227395 ZT8-11 10.671825 10.671825 10.671825 ZT12-15 16.41395 16.41395 16.41395 ZT16-19 19.651049999999998 19.651049999999998 19.651049999999998 ZT20-23 25.8609 25.8609 25.8609