condition mean min max ZT0-3 7.930927499999999 7.238325000000001 8.623529999999999 ZT4-7 4.280165 4.280165 4.280165 ZT8-11 4.98191 4.98191 4.98191 ZT12-15 0 0 0 ZT16-19 5.923095 5.923095 5.923095 ZT20-23 5.34239 5.34239 5.34239