condition mean min max ZT0-3 7.214645000000001 7.214645000000001 7.214645000000001 ZT4-7 5.947345 5.947345 5.947345 ZT8-11 5.96668 5.96668 5.96668 ZT12-15 7.167745 7.167745 7.167745 ZT16-19 8.111550000000001 8.111550000000001 8.111550000000001 ZT20-23 8.107165 8.107165 8.107165