condition mean min max ZT0-3 236.442382 236.442382 236.442382 ZT4-7 369.4086565 369.4086565 369.4086565 ZT8-11 413.1173675 413.1173675 413.1173675 ZT12-15 297.8876625 297.8876625 297.8876625 ZT16-19 192.675097 192.675097 192.675097 ZT20-23 153.76531749999998 153.76531749999998 153.76531749999998