condition mean min max ZT0-3 9.085272499999999 8.10704 10.063505 ZT4-7 7.788955 7.788955 7.788955 ZT8-11 4.297370000000001 4.297370000000001 4.297370000000001 ZT12-15 0 0 0 ZT16-19 5.99103 5.99103 5.99103 ZT20-23 8.81873 8.81873 8.81873