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Table 1 Low birthweight recurrence [LBWR]* according to maternal socio-economic and biological characteristics

From: Prognostic factors for low birthweight repetition in successive pregnancies: a cohort study

Variable N [%] LBWR [%] p
Economic status a [n = 408] b    0.008 c
 A and B 58 [14.2] 2 [3.5]  
 C 119 [29.2] 9 [7.5]  
 D 168 [41.2] 26 [15.5]  
 E (poorest) 63 [15.4] 14 [22.2]  
Father’s schooling (years) [n = 481] b    0.04 c
 0 – 4 113 [23.5] 23 [20.3]  
 5 – 8 208 [43.2] 31 [14.9]
 ≥ 9 160 [33.3] 18 [11.2]
Mother’s schooling (years) [n = 563] b    < 0.001 c
 0 – 4 132 [23.4] 32 [24.2]  
 5 – 8 261 [46.4] 39 [14.9]
 ≥ 9 170 [30.2] 15 [8.8]
Marital status [n = 565]    0.74 d
 Living with partner 65 [11.5] 9 [13.8]  
 Living without partner 500 [88.5] 77 [15.4]  
Mother’s age [n = 564] b    0.71 c
 15 - 20 82 [14.5] 13 [15.8]  
 21 - 25 162 [28.7] 27 [16.7]  
 26 - 30 136 [24.1] 17 [12.5]  
 31 - 35 108 [19.1] 17 [15.7]  
 36 - 44 76 [13.5] 11 [14.5]  
Mother’s skin color [n = 565]    0.65 d
 White 384 [68.0] 61 [15.9]  
 Non-white 142 [25.1] 21 [14.8]  
 Other 39 [6.9] 4 [10.3]  
Father’s age [n = 552] b    0.53 c
 16 - 20 23 [4.2] 6 [26.1]  
 21 - 25 123 [22.3] 19 [15.4]  
 26 - 30 127 [23.0] 17 [13.4]  
 31 - 35 134 [24.3] 19 [14.2]  
 36 - 64 145 [26.8] 22 [15.2]  
Mother’s height [cm] [n = 475] b    0.63c
 <150 23 [4.8] 6 [26.1]  
 150 - 154 60 [12.6] 10 [16.7]  
 155 - 159 88 [18.5] 15 [17.0]  
 160 - 164 95 [20.0] 10 [10.5]  
 ≥165 209 [44.0] 37 [17.7]  
LBW born-mother [n = 377] b    0.004 d
 No 320 [84.9] 39 [12.2]  
 Yes 57 [15.1] 15 [26.3]  
Preterm born-mother [n = 510] b    0.004d
 No 473 [92.7] 63 [13.3]  
 Yes 37 [7.3] 11 [29.7]  
  1. * LBWR defined as birth weight < 2,500 g in the index pregnancy (pregnancy that ended in 2004) amongst women with at least one previous LBW newborn in the two immediate pregnancies before the pregnancy that ended in 2004.
  2. a: Brazilian Research Companies Association; b: Indicates missing values; c: Linear trend; d: Chi-squared test for heterogeneity.