condition mean min max ZT0-3 6.106745 5.98447 6.22902 ZT4-7 8.39555 8.39555 8.39555 ZT8-11 5.494205 5.494205 5.494205 ZT12-15 0 0 0 ZT16-19 7.808209999999999 7.808209999999999 7.808209999999999 ZT20-23 9.162605 9.162605 9.162605