condition mean min max ZT0-3 100.758571 100.758571 100.758571 ZT4-7 109.7809185 109.7809185 109.7809185 ZT8-11 93.869743 93.869743 93.869743 ZT12-15 106.147718 106.147718 106.147718 ZT16-19 112.3392815 112.3392815 112.3392815 ZT20-23 165.7423445 165.7423445 165.7423445