condition mean min max ZT0-3 3.42022416825 2.6576912265 4.18275711 ZT4-7 0.8135714249999999 0.6706503134999999 0.9564925365 ZT8-11 2.28384889675 1.004768793 3.5629290005 ZT12-15 10.3756050085 7.2846634335000005 13.4665465835 ZT16-19 9.03337563425 8.5952709835 9.471480285 ZT20-23 10.16761372725 9.3045208445 11.03070661