Excluding outlier(s)
There was an extreme outlier in the CTG alone arm (a neonatal admission costing over AUD700,000). Post hoc re-analysis with this dyad excluded found the magnitude of the difference in the two arms was reduced, however the findings still showed the same direction of cost differences in the CTG+STan arm relative to CTG alone, including a reduction in overall costs in the CTG+STan arm (Table 3). The direction remained when the four most extreme cost cases (i.e. all cases with total costs over AUD100,000; 3 CTG only cases, 1 STan case) were removed from analysis, with the CTG+STan arm total costs on average lower by $393 (95%CI -$1,442, $655, p = 0.2309) than the CTG alone arm, still driven largely by reduced neonatal costs (on average $579 lower (95%CI -$1,278, $120), p= 0.0523).