condition mean min max ZT0-3 32.54878333333333 11.8933 44.0209 ZT4-7 9.14818 9.14818 9.14818 ZT8-11 9.59947 9.59947 9.59947 ZT12-15 14.040175 11.956949999999999 16.1234 ZT16-19 21.58155 21.58155 21.58155 ZT20-23 39.1471 39.1471 39.1471