45 to 150 versus 0: the studies by Gogtay, Rowland, in Pakistan, and Adak, in India, are removed, with extreme RR in the group of 6 studies: 2.21; 1.01 and 0.45; the 3 studies have RR between 0.57 and 0.90 and the RR is kept significant for the comparison of 5 studies RR = 0.69; 95%CI 0.54 - 0.87; p = 0.002.
45 a 150 versus 0: se eliminan los estudios de Gogtay, Rowland, en Pakistán, y Adak, en India, con RR de extremos en el grupo de 6 estudios: 2,21; 1,01 y 0,45; los 3 estudios restantes tienen RR entre 0,57 y 0,90 y se mantiene significativo el RR para la comparación de 5 estudios RR = 0,69; IC95% 0,54 - 0,87; p = 0,002.