condition mean min max ZT0-3 3725.406353 3725.406353 3725.406353 ZT4-7 6621.6562460000005 6621.6562460000005 6621.6562460000005 ZT8-11 4110.258047 4110.258047 4110.258047 ZT12-15 3245.369816 3245.369816 3245.369816 ZT16-19 1274.1118025 1274.1118025 1274.1118025 ZT20-23 1013.651419 1013.651419 1013.651419