condition mean min max ZT0-3 413.4988889 413.4988889 413.4988889 ZT4-7 409.445 409.445 409.445 ZT8-11 453.5588889 453.5588889 453.5588889 ZT12-15 406.38777776666666 406.38777776666666 406.38777776666666 ZT16-19 388.4111111 388.4111111 388.4111111 ZT20-23 387.3911111 387.3911111 387.3911111