condition mean min max ZT0-3 83.895364 83.895364 83.895364 ZT4-7 199.406822 199.406822 199.406822 ZT8-11 286.121524 286.121524 286.121524 ZT12-15 187.36233 187.36233 187.36233 ZT16-19 134.166473 134.166473 134.166473 ZT20-23 91.61779 91.61779 91.61779