condition mean min max ZT0-3 340.464294 340.464294 340.464294 ZT4-7 401.098422 401.098422 401.098422 ZT8-11 366.3446075 366.3446075 366.3446075 ZT12-15 388.0604855 388.0604855 388.0604855 ZT16-19 326.4266 326.4266 326.4266 ZT20-23 313.70105550000005 313.70105550000005 313.70105550000005