condition mean min max ZT0-3 39.00573333333333 27.48555 45.67115 ZT4-7 14.65605 14.65605 14.65605 ZT8-11 23.3324 23.3324 23.3324 ZT12-15 15.411975 12.74465 18.0793 ZT16-19 10.238050000000001 10.238050000000001 10.238050000000001 ZT20-23 20.66395 20.66395 20.66395