condition mean min max ZT0-3 352.865467 352.865467 352.865467 ZT4-7 328.045887 328.045887 328.045887 ZT8-11 409.3850265 409.3850265 409.3850265 ZT12-15 400.5161675 400.5161675 400.5161675 ZT16-19 452.153161 452.153161 452.153161 ZT20-23 422.8386355 422.8386355 422.8386355