condition mean min max ZT0-3 1.89664 1.89664 1.89664 ZT4-7 0.732394 0.732394 0.732394 ZT8-11 0.4948345 0.4948345 0.4948345 ZT12-15 2.64324 2.64324 2.64324 ZT16-19 5.195455 5.195455 5.195455 ZT20-23 3.035665 3.035665 3.035665