condition mean min max ZT0-3 799.367033 799.367033 799.367033 ZT4-7 867.1462745 867.1462745 867.1462745 ZT8-11 791.837262 791.837262 791.837262 ZT12-15 858.0136825 858.0136825 858.0136825 ZT16-19 752.5693120000001 752.5693120000001 752.5693120000001 ZT20-23 717.596237 717.596237 717.596237