condition mean min max ZT0-3 5.3380825000000005 4.672695 6.00347 ZT4-7 4.28467 4.28467 4.28467 ZT8-11 5.391355 5.391355 5.391355 ZT12-15 0 0 0 ZT16-19 4.59795 4.59795 4.59795 ZT20-23 7.826319999999999 7.826319999999999 7.826319999999999