condition mean min max ZT0-3 4.3985375 4.373265 4.42381 ZT4-7 4.48693 4.48693 4.48693 ZT8-11 8.808805 8.808805 8.808805 ZT12-15 0 0 0 ZT16-19 8.967839999999999 8.967839999999999 8.967839999999999 ZT20-23 5.779625 5.779625 5.779625