Table 1.

Class membership and EPDS symptom Endorsement Probabilities across latent classes, including cases and controls

	Class 1 (n=3484)	Class 2 (n=2342)	Class 3 (n=730)
EPDS1 Laugh and see the funny side of things
As much as I could	0·92	0·28	0·56
Not quite as much	0·07	0·52	0·16
Definitely not so much now	0	0·19	0·18
Not at all	0·01	0·01	0·11
EPDS2- Look forward with enjoyment
As much as I ever did	0·92	0·32	0·54
Rather less than I used to	0·08	0·49	0·15
Definitely less than I used to	0	0·16	0·17
Hardly at all	0	0·03	0·14
EPDS3- Blamed myself unnecessarily
No, never	0·56	0·09	0·33
Not very often	0·27	0·20	0·18
Yes, some of the time	0·16	0·56	0·30
Yes, most of the time	0·01	0·14	0·19
EPDS4- Anxious or worried for no good reason
No, not at all	0·37	0·09	0·09
Hardly ever	0·26	0·32	0·15
Yes, sometimes	0·18	0·43	0·29
Yes, very often	0·20	0·16	0·47
EPDS5-Scared or panicky for no very good reason
No, not at all	0·79	0·25	0·05
No, not much	0·16	0·35	0·11
Yes sometimes	0·04	0·34	0·24
Yes quite a lot	0·01	0·06	0·61
EPDS6- Things have been getting on top of me
No, coping as well as ever	0·52	0·07	0·03
No, coped quite well most of the time	0·37	0·35	0·09
Yes, I haven’t been coping as well as usual	0·11	0·53	0·42
Yes, Most of the time I haven’t been able to cope	0	0·05	0·47
EPDS7- Been so unhappy had difficulty sleeping
No, not at all	0·94	0·26	0·01
Not very often	0·06	0·38	0·03
Yes, sometimes	0	0·32	0·20
Yes, Most of the time	0	0·04	0·77
EPDS8- Felt sad or miserable
No, not at all	0·82	0·04	0·01
Not very often	0·17	0·46	0·01
Yes, quite often	0·01	0·46	0·26
Yes, most of the time	0	0·05	0·73
EPDS9- been so unhappy that I have been crying
No, never	0·86	0·12	0·01
Only occasionally	0·14	0·53	0·02
Yes, quite often	0	0·30	0·25
Yes, most of the time	0	0·04	0·72
EPDS10- thought of harming myself has occurred to me
Never	0·99	0·80	0·19
Hardly ever	0·01	0·11	0·07
Sometimes	0	0·06	0·12
Yes, quite often	0	0·04	0·63

EPDS=Edinburgh postnatal depression scale.