condition mean min max ZT0-3 9.711702 9.711702 9.711702 ZT4-7 10.0022345 10.0022345 10.0022345 ZT8-11 9.711041999999999 9.711041999999999 9.711041999999999 ZT12-15 9.096335 9.096335 9.096335 ZT16-19 10.564411 10.564411 10.564411 ZT20-23 11.9611475 11.9611475 11.9611475