condition mean min max ZT0-3 30.6 30.6 30.6 ZT4-7 13.0 13.0 13.0 ZT8-11 51.45 51.45 51.45 ZT12-15 14.25 14.25 14.25 ZT16-19 11.450000000000001 11.450000000000001 11.450000000000001 ZT20-23 13.149999999999999 13.149999999999999 13.149999999999999