condition mean min max ZT0-3 17.552088 17.552088 17.552088 ZT4-7 19.439697 19.439697 19.439697 ZT8-11 24.8426935 24.8426935 24.8426935 ZT12-15 21.338785 21.338785 21.338785 ZT16-19 39.477965 39.477965 39.477965 ZT20-23 39.6146045 39.6146045 39.6146045