condition mean min max ZT0-3 8.64447 8.64447 8.64447 ZT4-7 5.79148 5.79148 5.79148 ZT8-11 15.8767 15.8767 15.8767 ZT12-15 22.74795 22.74795 22.74795 ZT16-19 19.543599999999998 19.543599999999998 19.543599999999998 ZT20-23 11.38175 11.38175 11.38175