SYSTEM_THREAD_INFORMATION - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers
#ifndef _NTEXAPI_H

typedef struct _SYSTEM_THREAD_INFORMATION
{
    LARGE_INTEGER KernelTime;
    LARGE_INTEGER UserTime;
    LARGE_INTEGER CreateTime;
    ULONG WaitTime;
    PVOID StartAddress;
    CLIENT_ID ClientId;
    KPRIORITY Priority;
    KPRIORITY BasePriority;
    ULONG ContextSwitches;
    KTHREAD_STATE ThreadState;
    KWAIT_REASON WaitReason;
} SYSTEM_THREAD_INFORMATION, *PSYSTEM_THREAD_INFORMATION;

#endif

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This type is documented in the [MS-TSTS] specification.