condition mean min max ZT0-3 8.892882499999999 8.72309 9.062675 ZT4-7 7.033635 7.033635 7.033635 ZT8-11 12.80995 12.80995 12.80995 ZT12-15 0 0 0 ZT16-19 13.60145 13.60145 13.60145 ZT20-23 9.492815 9.492815 9.492815