condition mean min max ZT0-3 24.499016666666666 20.92935 26.39705 ZT4-7 24.0246 24.0246 24.0246 ZT8-11 19.25725 19.25725 19.25725 ZT12-15 22.211575 21.3716 23.05155 ZT16-19 19.863500000000002 19.863500000000002 19.863500000000002 ZT20-23 26.705399999999997 26.705399999999997 26.705399999999997