condition mean min max ZT0-3 36.013068 36.013068 36.013068 ZT4-7 56.81298700000001 56.81298700000001 56.81298700000001 ZT8-11 60.487168499999996 60.487168499999996 60.487168499999996 ZT12-15 59.108827500000004 59.108827500000004 59.108827500000004 ZT16-19 48.585854999999995 48.585854999999995 48.585854999999995 ZT20-23 52.0589375 52.0589375 52.0589375