What it does

Checks whether the given sex of the samples are probable. It issues the query:

SELECT gt_types
FROM   variants
WHERE  chrom = '$chrom'
AND start > 2699520 and start < 154931044
AND call_rate > 0.90
AND depth > 1000
AND filter is NULL
ORDER BY random()
LIMIT 10000

and returns the called variants on that region of the given chromosome in a table:

sample  sex     X_homref  X_het  X_homalt  het_homref_ratio
SMS173  male    7265      1975   8010      0.271851342051
SMS254  male    5440      1316   3846      0.241911764706
SMS255  female  6275      3188   5423      0.508047808765
SMS253  male    5536      1355   3582      0.244761560694
SMS243  male    6181      1506   4479      0.243649894839
SMS242  male    6365      1437   4200      0.225765907306
SMS193  male    6667      1864   5829      0.279586020699
SMS238  male    6263      1638   4891      0.261536005109
SMS239  female  6755      3669   7618      0.543153219837
SMS244  female  6489      2953   5140      0.45507782401
SMS230  male    7209      1784   7146      0.247468442225
SMS231  female  7306      4659   9332      0.637695045168