condition mean min max ZT0-3 7661.0 7661.0 7661.0 ZT4-7 6944.7 6944.7 6944.7 ZT8-11 7029.05 7029.05 7029.05 ZT12-15 5911.6 5911.6 5911.6 ZT16-19 5674.450000000001 5674.450000000001 5674.450000000001 ZT20-23 6856.25 6856.25 6856.25