condition mean min max ZT0-3 4.34369282475 2.0301109294999997 6.65727472 ZT4-7 0.20491289124999998 0.11739671899999998 0.2924290635 ZT8-11 15.18018578525 5.408314736 24.9520568345 ZT12-15 47.75460907 42.746590265 52.76262787500001 ZT16-19 10.053682896 7.42983599 12.677529802 ZT20-23 2.137821407 1.2411595205000001 3.0344832935