condition mean min max ZT0-3 130.770518 130.770518 130.770518 ZT4-7 355.378705 355.378705 355.378705 ZT8-11 355.0808105 355.0808105 355.0808105 ZT12-15 315.224107 315.224107 315.224107 ZT16-19 178.8198505 178.8198505 178.8198505 ZT20-23 148.0971475 148.0971475 148.0971475