condition mean min max ZT0-3 7.5364975 6.073235 8.99976 ZT4-7 4.188505 4.188505 4.188505 ZT8-11 0.3752405 0.3752405 0.3752405 ZT12-15 0 0 0 ZT16-19 4.106355 4.106355 4.106355 ZT20-23 13.127600000000001 13.127600000000001 13.127600000000001