condition mean min max ZT0-3 23.00705 22.030900000000003 23.9832 ZT4-7 22.66385 22.66385 22.66385 ZT8-11 17.877699999999997 17.877699999999997 17.877699999999997 ZT12-15 0 0 0 ZT16-19 22.195749999999997 22.195749999999997 22.195749999999997 ZT20-23 21.57385 21.57385 21.57385