condition mean min max ZT0-3 9.794975 9.794975 9.794975 ZT4-7 4.644625 4.644625 4.644625 ZT8-11 2.879555 2.879555 2.879555 ZT12-15 5.72157 5.72157 5.72157 ZT16-19 11.51705 11.51705 11.51705 ZT20-23 12.2391 12.2391 12.2391