$result = mysqli_fetch_all($DB->iselect("SELECT * FROM matches WHERE coef_tm_one_half >= 1.33 AND coef_tm_one_half <= 1.6 ORDER BY id ASC"),MYSQLI_ASSOC);
// coef_tm_one_half ( type decimal(6, 3) )
if ($stat['coef_tm_one_half'] >= 1.33 AND $stat['coef_tm_one_half'] <= 1.6) // корректно ли будет сравнение?