condition mean min max ZT0-3 895.523573 895.523573 895.523573 ZT4-7 1062.0588794999999 1062.0588794999999 1062.0588794999999 ZT8-11 982.538611 982.538611 982.538611 ZT12-15 1117.0481255 1117.0481255 1117.0481255 ZT16-19 1098.8694605 1098.8694605 1098.8694605 ZT20-23 1200.731534 1200.731534 1200.731534