condition mean min max ZT0-3 1.2989723082499998 1.028901701 1.5690429154999999 ZT4-7 2.0779798455 2.048535837 2.107423854 ZT8-11 2.36372171725 2.1543848575 2.573058577 ZT12-15 4.16706336575 3.169897486 5.1642292455 ZT16-19 4.557628138249999 4.152702142 4.9625541344999995 ZT20-23 7.51615093925 7.336102636500001 7.6961992420000005