condition mean min max ZT0-3 77.687777 56.64510835 98.73044565 ZT4-7 95.27857508 90.00018169 100.55696847 ZT8-11 170.6381795975 127.927911295 213.3484479 ZT12-15 186.223037975 160.96565155 211.4804244 ZT16-19 90.5732156075 77.52045816 103.625973055 ZT20-23 53.377238475 47.29080815499999 59.463668795000004