condition mean min max ZT0-3 67.043441 67.043441 67.043441 ZT4-7 75.104291 75.104291 75.104291 ZT8-11 74.7971915 74.7971915 74.7971915 ZT12-15 83.10571350000001 83.10571350000001 83.10571350000001 ZT16-19 74.84666 74.84666 74.84666 ZT20-23 53.874902500000005 53.874902500000005 53.874902500000005