condition mean min max ZT0-3 41.98986857 41.42028886 42.55944828 ZT4-7 40.1782877575 35.527220145 44.829355369999995 ZT8-11 81.55889771 61.18969443 101.92810099 ZT12-15 55.05700105750001 32.315159815 77.79884230000002 ZT16-19 19.762782882499998 16.251947225 23.27361854 ZT20-23 12.659112385 12.39351199 12.92471278