condition mean min max ZT0-3 10.744182 10.744182 10.744182 ZT4-7 12.402379 12.402379 12.402379 ZT8-11 10.092318500000001 10.092318500000001 10.092318500000001 ZT12-15 9.8806605 9.8806605 9.8806605 ZT16-19 10.3793145 10.3793145 10.3793145 ZT20-23 13.898671499999999 13.898671499999999 13.898671499999999