condition mean min max ZT0-3 191.149109 191.149109 191.149109 ZT4-7 187.9683085 187.9683085 187.9683085 ZT8-11 190.24311799999998 190.24311799999998 190.24311799999998 ZT12-15 202.688202 202.688202 202.688202 ZT16-19 222.08340049999998 222.08340049999998 222.08340049999998 ZT20-23 156.116672 156.116672 156.116672