condition mean min max ZT0-3 383.627902 383.627902 383.627902 ZT4-7 675.759032 675.759032 675.759032 ZT8-11 871.744128 871.744128 871.744128 ZT12-15 757.6082365 757.6082365 757.6082365 ZT16-19 366.507243 366.507243 366.507243 ZT20-23 279.0202795 279.0202795 279.0202795