condition mean min max ZT0-3 1.5268074999999999 1.484775 1.56884 ZT4-7 1.4870649999999999 1.4870649999999999 1.4870649999999999 ZT8-11 2.12391 2.12391 2.12391 ZT12-15 0 0 0 ZT16-19 1.771195 1.771195 1.771195 ZT20-23 2.0898085 2.0898085 2.0898085