condition mean min max ZT0-3 8.990954 8.990954 8.990954 ZT4-7 8.683689000000001 8.683689000000001 8.683689000000001 ZT8-11 8.703002000000001 8.703002000000001 8.703002000000001 ZT12-15 12.232153499999999 12.232153499999999 12.232153499999999 ZT16-19 12.9128475 12.9128475 12.9128475 ZT20-23 24.8428085 24.8428085 24.8428085