condition mean min max ZT0-3 4.48432 4.063155 4.905485 ZT4-7 6.154275 6.154275 6.154275 ZT8-11 5.302085 5.302085 5.302085 ZT12-15 0 0 0 ZT16-19 4.45066 4.45066 4.45066 ZT20-23 4.50167 4.50167 4.50167