condition mean min max ZT0-3 25.299999999999997 25.299999999999997 25.299999999999997 ZT4-7 5.2 5.2 5.2 ZT8-11 11.350000000000001 11.350000000000001 11.350000000000001 ZT12-15 5.6499999999999995 5.6499999999999995 5.6499999999999995 ZT16-19 7.9 7.9 7.9 ZT20-23 10.85 10.85 10.85