condition mean min max ZT0-3 10.388262 10.388262 10.388262 ZT4-7 11.319588 11.319588 11.319588 ZT8-11 9.8998965 9.8998965 9.8998965 ZT12-15 10.3320165 10.3320165 10.3320165 ZT16-19 10.843910999999999 10.843910999999999 10.843910999999999 ZT20-23 11.041907 11.041907 11.041907