condition mean min max ZT0-3 12.149999999999999 12.149999999999999 12.149999999999999 ZT4-7 11.5 11.5 11.5 ZT8-11 14.7 14.7 14.7 ZT12-15 12.15 12.15 12.15 ZT16-19 7.800000000000001 7.800000000000001 7.800000000000001 ZT20-23 14.0 14.0 14.0