condition mean min max ZT0-3 11.676897499999999 7.788245 15.56555 ZT4-7 6.20215 6.20215 6.20215 ZT8-11 3.972505 3.972505 3.972505 ZT12-15 0 0 0 ZT16-19 4.203825 4.203825 4.203825 ZT20-23 6.299775 6.299775 6.299775