condition mean min max ZT0-3 4.5128699999999995 4.5128699999999995 4.5128699999999995 ZT4-7 2.5978450000000004 2.5978450000000004 2.5978450000000004 ZT8-11 3.242445 3.242445 3.242445 ZT12-15 5.034885 5.034885 5.034885 ZT16-19 7.861365 7.861365 7.861365 ZT20-23 4.93393 4.93393 4.93393