condition mean min max ZT0-3 22.924854 22.924854 22.924854 ZT4-7 57.563821499999996 57.563821499999996 57.563821499999996 ZT8-11 25.4344905 25.4344905 25.4344905 ZT12-15 17.056277 17.056277 17.056277 ZT16-19 100.368249 100.368249 100.368249 ZT20-23 208.7362235 208.7362235 208.7362235