condition mean min max ZT0-3 3.10089 3.10089 3.10089 ZT4-7 3.0376849999999997 3.0376849999999997 3.0376849999999997 ZT8-11 4.44187 4.44187 4.44187 ZT12-15 4.12124 4.12124 4.12124 ZT16-19 5.256835000000001 5.256835000000001 5.256835000000001 ZT20-23 3.294815 3.294815 3.294815