condition mean min max ZT0-3 0.818454 0.818454 0.818454 ZT4-7 0.7461800000000001 0.7461800000000001 0.7461800000000001 ZT8-11 1.232125 1.232125 1.232125 ZT12-15 3.221705 3.221705 3.221705 ZT16-19 2.2506649999999997 2.2506649999999997 2.2506649999999997 ZT20-23 1.0340405 1.0340405 1.0340405