condition mean min max ZT0-3 2.0301555000000002 0.5731815 3.1291 ZT4-7 0.358707 0.358707 0.358707 ZT8-11 0.5458455 0.5458455 0.5458455 ZT12-15 1.41964575 0.9348365 1.904455 ZT16-19 3.4733099999999997 3.4733099999999997 3.4733099999999997 ZT20-23 4.54893 4.54893 4.54893