condition mean min max ZT0-3 3.4495500000000003 3.3919550000000003 3.5071450000000004 ZT4-7 12.061765000000001 12.061765000000001 12.061765000000001 ZT8-11 5.043749999999999 5.043749999999999 5.043749999999999 ZT12-15 0 0 0 ZT16-19 4.36289 4.36289 4.36289 ZT20-23 3.7845950000000004 3.7845950000000004 3.7845950000000004