condition mean min max ZT0-3 10.434195 10.434195 10.434195 ZT4-7 9.386352 9.386352 9.386352 ZT8-11 9.043633 9.043633 9.043633 ZT12-15 9.017620999999998 9.017620999999998 9.017620999999998 ZT16-19 10.240921499999999 10.240921499999999 10.240921499999999 ZT20-23 9.454543000000001 9.454543000000001 9.454543000000001