condition mean min max ZT0-3 13.7577 12.33685 15.178550000000001 ZT4-7 16.39565 16.39565 16.39565 ZT8-11 16.9172 16.9172 16.9172 ZT12-15 0 0 0 ZT16-19 22.073050000000002 22.073050000000002 22.073050000000002 ZT20-23 20.383499999999998 20.383499999999998 20.383499999999998