condition mean min max ZT0-3 8.45 8.45 8.45 ZT4-7 7.0 7.0 7.0 ZT8-11 29.1 29.1 29.1 ZT12-15 4.6 4.6 4.6 ZT16-19 10.149999999999999 10.149999999999999 10.149999999999999 ZT20-23 9.1 9.1 9.1