condition mean min max ZT0-3 17.0191141725 15.16660643 18.871621915 ZT4-7 7.393678614250001 5.4013495035000005 9.386007725 ZT8-11 11.785716081499999 6.7206167599999995 16.850815403 ZT12-15 24.571238564999998 21.29597792 27.846499209999998 ZT16-19 22.488614452500002 20.997421225 23.97980768 ZT20-23 17.23289834 14.511170905 19.954625774999997