condition mean min max ZT0-3 176.842417 176.842417 176.842417 ZT4-7 140.493399 140.493399 140.493399 ZT8-11 154.6669525 154.6669525 154.6669525 ZT12-15 129.5975535 129.5975535 129.5975535 ZT16-19 145.120223 145.120223 145.120223 ZT20-23 150.520974 150.520974 150.520974