condition mean min max ZT0-3 276.927906925 263.46245745 290.39335639999996 ZT4-7 122.8728559875 98.19835172500001 147.54736025 ZT8-11 64.039038415 59.14169972 68.93637711 ZT12-15 80.492236845 80.367836485 80.61663720499999 ZT16-19 93.19682130500001 87.32746098000001 99.06618163 ZT20-23 116.691543325 116.58630389999999 116.79678274999999