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Table 1 Descriptive statistics for perinatal covariates

From: Perinatal and psychosocial circumstances associated with risk of attempted suicide, non-suicidal self-injury and psychiatric service use. A longitudinal study of young people

Perinatal covariates all @11p N (%)
Maternal parity   
   0 first born 989 45.9
   *1 second born 784 36.3
   *2+ third or later 384 17.8
Family size (total at age 11) +Twins   
   2 247 11.5
   *3 1001 46.4
   *4+ 909 42.1
Birth size [MV = 20]   
   Small 293 13.7
   Average 1458 68.2
   Large 386 18.1
Birth weight (g) [MV = 96]   
   <2500 133 6.5
   2500-3249 719 34.9
   3250-3749 801 38.9
   3750+ 408 19.8
Birth complications [MV = 15]   
   0 1499 70.0
   1 360 16.8
   *2 189 8.8
   *3 or more 94 4.4
Birth spacing - Prior birth   
   Under 2 years 346 16.0
   2-5 years 502 23.3
   6+ years or singleton 1309 60.7
Birth spacing - Next birth   
   Under 2 years 429 19.9
   2-5 years 510 23.6
   6+ years or singleton 1218 56.5
Maternal age (years) [MV = 79]   
   15-19 139 6.7
   20-24 626 30.1
   25-29 764 36.8
   30-34 421 20.3
   35-46 128 6.2
Breastfeeding [MV = 12]   
   None 1333 62.1
   Less than 6 months 463 21.6
   6 months or more 349 16.3
  1. Baseline N = 2157, final sample excludes adopted children i.e. only natural mother.
  2. MV = missing values; * Adjacent category collapsed for analysis; +Twins = includes 16 twin births.
  3. @11p = parental figure provided information when participants age 11.