condition mean min max ZT0-3 12.17535 12.17535 12.17535 ZT4-7 11.711525000000002 11.711525000000002 11.711525000000002 ZT8-11 9.013110000000001 9.013110000000001 9.013110000000001 ZT12-15 9.51597 9.51597 9.51597 ZT16-19 11.71265 11.71265 11.71265 ZT20-23 11.6415 11.6415 11.6415