condition mean min max ZT0-3 746.0 746.0 746.0 ZT4-7 738.0 738.0 738.0 ZT8-11 760.75 760.75 760.75 ZT12-15 835.0 835.0 835.0 ZT16-19 859.1500000000001 859.1500000000001 859.1500000000001 ZT20-23 759.65 759.65 759.65