condition mean min max ZT0-3 53.580944294249996 17.3057823785 89.85610621 ZT4-7 14.341677906000001 8.566669167 20.116686645 ZT8-11 35.773618129999996 31.48862659 40.058609669999996 ZT12-15 49.121332912499994 47.999813415 50.24285241 ZT16-19 34.35390945 33.111171505 35.596647395000005 ZT20-23 28.093328735 27.04203852 29.14461895