condition mean min max ZT0-3 53.734478 53.734478 53.734478 ZT4-7 55.053432 55.053432 55.053432 ZT8-11 61.320994999999996 61.320994999999996 61.320994999999996 ZT12-15 70.669937 70.669937 70.669937 ZT16-19 72.0007485 72.0007485 72.0007485 ZT20-23 59.157477 59.157477 59.157477