condition mean min max ZT0-3 10.763567 10.763567 10.763567 ZT4-7 10.405763 10.405763 10.405763 ZT8-11 10.0994385 10.0994385 10.0994385 ZT12-15 9.1470485 9.1470485 9.1470485 ZT16-19 11.4540745 11.4540745 11.4540745 ZT20-23 10.597197999999999 10.597197999999999 10.597197999999999