condition mean min max ZT0-3 337.988041 337.988041 337.988041 ZT4-7 393.6942355 393.6942355 393.6942355 ZT8-11 571.4564365 571.4564365 571.4564365 ZT12-15 524.244914 524.244914 524.244914 ZT16-19 546.79437 546.79437 546.79437 ZT20-23 374.9414335 374.9414335 374.9414335