condition mean min max ZT0-3 36.64492 36.64492 36.64492 ZT4-7 29.6686135 29.6686135 29.6686135 ZT8-11 32.8933215 32.8933215 32.8933215 ZT12-15 33.5790735 33.5790735 33.5790735 ZT16-19 40.2012085 40.2012085 40.2012085 ZT20-23 43.226991999999996 43.226991999999996 43.226991999999996