condition mean min max ZT0-3 17.074975000000002 16.6491 17.50085 ZT4-7 15.783249999999999 15.783249999999999 15.783249999999999 ZT8-11 15.259 15.259 15.259 ZT12-15 0 0 0 ZT16-19 14.5177 14.5177 14.5177 ZT20-23 15.8799 15.8799 15.8799