condition mean min max ZT0-3 1.2199323515 1.178507988 1.261356715 ZT4-7 1.471031277 1.447675164 1.49438739 ZT8-11 1.6065046572500001 1.19576655 2.0172427645 ZT12-15 1.66563373925 1.663497054 1.6677704245 ZT16-19 1.96882808175 1.6549057169999999 2.2827504465 ZT20-23 2.5925596185 2.3355693775 2.8495498594999997