condition mean min max ZT0-3 9.63357 9.63357 9.63357 ZT4-7 16.139557 16.139557 16.139557 ZT8-11 12.2237795 12.2237795 12.2237795 ZT12-15 12.4811955 12.4811955 12.4811955 ZT16-19 13.4458625 13.4458625 13.4458625 ZT20-23 12.7281405 12.7281405 12.7281405