condition mean min max ZT0-3 211.818382 211.818382 211.818382 ZT4-7 232.3629745 232.3629745 232.3629745 ZT8-11 232.21112 232.21112 232.21112 ZT12-15 218.425473 218.425473 218.425473 ZT16-19 90.4556925 90.4556925 90.4556925 ZT20-23 75.863957 75.863957 75.863957