condition mean min max ZT0-3 12.97045 12.90495 13.03595 ZT4-7 15.768650000000001 15.768650000000001 15.768650000000001 ZT8-11 13.43605 13.43605 13.43605 ZT12-15 0 0 0 ZT16-19 13.003499999999999 13.003499999999999 13.003499999999999 ZT20-23 14.2574 14.2574 14.2574