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Table 1 Summary statistics for pregnancy-related transfers in Australia by operation area, Royal Flying Doctor Service, 2015–2019

From: Pregnancy-related aeromedical retrievals in rural and remote Australia: national evidence from the Royal Flying Doctor Service

   Total Operation area p-value
Centra (NT – SA) Queenslan (QLD) South East (NSW) Western (WA)
  Alla 147,979 37,049 44,874 32,358 33,666  
  Pregnancy a,b 4653 1125 1521 393 1614  
  % 3.1% 3.0% 3.4% 1.2% 4.8% < 0.001*
Years
 2015–16 Alla 35,949 8758 10,856 7861 8457 < 0.001*
Pregnancy a,b 1104 249 299 112 444  
% 3.1% 2.8% 2.8% 1.4% 5.3%  
 2016–17 Alla 36,567 9103 11,221 8023 8218 < 0.001*
Pregnancy a,b 1133 252 371 120 390  
% 3.1% 2.8% 3.3% 1.5% 4.7%  
 2017–18 Alla 37,472 9686 11,249 8106 8428 < 0.001*
Pregnancy a,b 1106 244 435 65 362  
% 3.0% 2.5% 3.9% 0.8% 4.3%  
 2018–19 Alla 37,991 9502 11,548 8368 8563 < 0.001*
Pregnancy a,b 1310 380 416 96 418  
% 3.5% 4.0% 3.6% 1.1% 4.9%  
p-value 0.01c < 0.001c < 0.001c < 0.001c < 0.001c  
Women characteristics
Age in years Mean ± SD 27.8 ± 6.1 27.4 ± 6.1 27.7 ± 6.0 26.6 ± 6.2 28.3 ± 6.3 < 0.07**
Aboriginal or Torres Strait Islander
 Yes n (%) 1584 (34.0) 446 (39.6) 347 (22.8) 166 (42.2) 625 (38.7) < 0.001†
 No   2672 (57.4) 678 (60.3) 786 (51.7) 223 (56.7) 985 (61.0)  
 Not stated   397 (8.5) 1 (0.1) 388 (25.5) 4 (1.0) 4 (0.3)  
Travel characteristics
Distance flown (n = 1132) Median [p25-p75] 300 [211–464] 246 [213–347] 313 [232–472] 300 [239–380] 357 [196–564] < 0.001††
Flight authorisation times (n = 3343)
 0 am - 6 am n (%) 369 (11.0) 114 (15.3) 102 (9.2) 29 (9.8) 124 (10.4) < 0.001†
 7 am - 7 pm   2353 (70.4) 478 (64.2) 832 (75.3) 213 (71.7) 830 (69.4)  
 8 pm - 11 pm   621 (18.6) 153 (20.5) 171 (15.5) 55 (18.5) 242 (20.2)  
  1. NT North Territory, SA South Australia, QLD Queensland, NSW New South Wales, WA Western Australia
  2. a – Excluding repatriations
  3. b – Females aged 15–49 years with an obstetric condition (ICD10) as the primary diagnosis for retrieval. Multiple transfer legs considered as single transfers
  4. c – P-value for the comparison of the proportion of pregnancy-related retrievals between 2015 and 16 and 2018–19
  5. * Chi-squared test of heterogeneity comparing the prevalence of pregnancy-related retrievals between operation areas
  6. ** ANOVA test for heterogeneity for the difference in maternal age according to the operation area
  7. † Chi-squared test for heterogeneity for the distribution of indigenous status or flight authorisation times according to operation area
  8. †† Kruskal-Wallis test for the difference in median distance flown according to the operation area