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Table 5 Numbers of retrieved studies and pooled odds ratio for the association of breastfeeding with the risk of five individual cancer types

From: Breastfeeding and the risk of childhood cancer: a systematic review and dose-response meta-analysis

  Ever versus non/occasional breastfeeding Longest breastfeeding versus shortest breastfeeding
Cancer type No. of studies OR (95%CI) P value I2 (%) P value for heterogeneity No. of studies OR (95%CI) P value I2 (%) P value for heterogeneity
Neuroblastoma 4 0.59 (0.44 ~ 0.81) 0.001 29.2 0.237 4 0.61 (0.44 ~ 0.83) 0.002 0.0 0.482
Soft-tissue sarcoma 4 0.79 (0.44 ~ 1.44) 0.448 37.1 0.189 3 0.69 (0.14 ~ 3.44) 0.649 63.9 0.063
Nephroblastoma 3 0.63 (0.41 ~ 0.98) 0.041 57.2 0.097 3 0.76 (0.44 ~ 1.32) 0.324 49.1 0.140
Retinoblastoma 2 1.32 (0.17 ~ 10.24) 0.792 72.6 0.056 2 1.08 (0.57 ~ 2.07) 0.807 0.0 0.411
Germ cell tumors 2 1.08 (0.73 ~ 1.60) 0.708 0.0 0.639 2 2.64 (1.05 ~ 6.60) 0.038 0.0 0.319