condition mean min max ZT0-3 30.092244355 27.59784093 32.58664778 ZT4-7 14.042437395 14.029731145 14.055143645 ZT8-11 10.33474903025 8.581223064 12.088274996500001 ZT12-15 2.7716769017500003 2.047436983 3.4959168205 ZT16-19 2.0801638330000003 1.6627872885000001 2.4975403775 ZT20-23 3.5286043897500003 2.8155490155000003 4.241659764