condition mean min max ZT0-3 44.21365 39.063199999999995 49.3641 ZT4-7 57.774249999999995 57.774249999999995 57.774249999999995 ZT8-11 85.65915 85.65915 85.65915 ZT12-15 0 0 0 ZT16-19 59.48715 59.48715 59.48715 ZT20-23 65.64585 65.64585 65.64585