E-grader enquiry

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E-grader enquiry

I have received below percentage fo ressay readability from e-grader but what are those items mean?
Also, is this grade reliable enough? In other words, how accurate is the e-grader?
Is the score given by the e-grader similar to the score from real Ielts tests?

Essay readability:
automated_readability_index: 14.0 13.0946893788 107% => OK
flesch_reading_ease: 41.7 50.2224549098 83% => OK
smog_index: 8.8 7.44779559118 118% => OK
flesch_kincaid_grade: 12.7 11.3001002004 112% => OK
coleman_liau_index: 13.34 12.4159519038 107% => OK
dale_chall_readability_score: 8.71 8.58950901804 101% => OK
difficult_words: 108.0 78.4519038076 138% => OK
linsear_write_formula: 8.5 9.78957915832 87% => OK
gunning_fog: 10.4 10.1190380762 103% => OK
text_standard: 9.0 10.7795591182 83% => OK

1. What are those items mean?

1. What are those items mean? it goes to this page:
http://www.testbig.com/forum/readability-index-scores

2. Also, is this grade reliable enough? In other words, how accurate is the e-grader? Is the score given by the e-grader similar to the score from real Ielts tests?

The score by e-grader is based on the language/readability of 20,000 essays. It doesn't check the meaning of the words or ideas. If you don't write the essay out of the topic, the score is very close to the real IELTS tests (though it is not 100%). If you still have doubts about the marks, you may ask English teachers, or IELTS tutors double check the marks, or upgrade to VIP users to receive further evaluations by advanced module of e-grader and human graders.