Table 3.

Presentation of statistically significant differences in development stages for the teeth 37–31 when the extremely preterm group (EPT) is compared to the full-term group (FT)

Group differences EPT/FT for each individual tooth 37–31 (p value or NSa)
Observer	37	36	35	34	33	32	31
1	0.010	NS	NS	0.002	NS	0.013	NS
2	0.000	NS	NS	NS	NS	0.002	0.005
3	0.000	0.003	0.003	NS	0.001	NS	NS
4	0.002	NS	NS	0.023	0.006	NS	NS
5	0.000	0.012	NS	NS	0.012	0.023	0.001

^aNS not significant P ≥ 0.05)