condition mean min max ZT0-3 87.198633 87.198633 87.198633 ZT4-7 71.628233 71.628233 71.628233 ZT8-11 73.5392705 73.5392705 73.5392705 ZT12-15 85.09795249999999 85.09795249999999 85.09795249999999 ZT16-19 68.61879400000001 68.61879400000001 68.61879400000001 ZT20-23 137.1967495 137.1967495 137.1967495