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sub calcStdDev {
  my ($dbh) = @_;
...
60000 [377 wallclock secs (356.05 usr + 13.11 sys = 369.16 CPU)]
70000 [497 wallclock secs (414.08 usr + 59.97 sys = 474.04 CPU)]
80000 [610 wallclock secs (471.53 usr + 88.27 sys = 559.80 CPU)]