SPACI score report for 1zao in ASTRAL 1.73:

PDB Entry: 1zao
SPACI score: 0.53
AEROSPACI score: 0.53

Experiment type: XRAY
Resolution: 1.84
R-factor: 0.184
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 1
WCK1 WHAT_CHECK Packing: 0.411
WCK2 WHAT_CHECK Ramachandran: 1.353
WCK3 WHAT_CHECK Chi angles: 1.176
WCK4 WHAT_CHECK Backbone: -2.346

Note: Here are links to pages about PROCHECK and WHAT_CHECK.

Here is the full WHAT_CHECK report on this protein (linked from the WHAT_CHECK site).