condition mean min max ZT0-3 133.15333333333334 121.73400000000001 145.1455 ZT4-7 113.32249999999999 113.32249999999999 113.32249999999999 ZT8-11 96.19425000000001 96.19425000000001 96.19425000000001 ZT12-15 116.24365 105.7093 126.77799999999999 ZT16-19 132.6695 132.6695 132.6695 ZT20-23 157.79450000000003 157.79450000000003 157.79450000000003