condition mean min max ZT0-3 14.9 14.9 14.9 ZT4-7 12.8 12.8 12.8 ZT8-11 12.5 12.5 12.5 ZT12-15 12.600000000000001 12.600000000000001 12.600000000000001 ZT16-19 14.649999999999999 14.649999999999999 14.649999999999999 ZT20-23 17.5 17.5 17.5