condition mean min max ZT0-3 11.847093 11.847093 11.847093 ZT4-7 12.475783499999999 12.475783499999999 12.475783499999999 ZT8-11 13.059575500000001 13.059575500000001 13.059575500000001 ZT12-15 11.0435905 11.0435905 11.0435905 ZT16-19 11.988419 11.988419 11.988419 ZT20-23 11.665394 11.665394 11.665394