condition mean min max ZT0-3 6.8345 6.8345 6.8345 ZT4-7 4.9553899999999995 4.9553899999999995 4.9553899999999995 ZT8-11 6.76995 6.76995 6.76995 ZT12-15 8.370574999999999 8.370574999999999 8.370574999999999 ZT16-19 7.16529 7.16529 7.16529 ZT20-23 6.222345000000001 6.222345000000001 6.222345000000001