condition mean min max ZT0-3 12.9164 12.9164 12.9164 ZT4-7 8.29401 8.29401 8.29401 ZT8-11 13.272300000000001 13.272300000000001 13.272300000000001 ZT12-15 27.307949999999998 27.307949999999998 27.307949999999998 ZT16-19 23.144 23.144 23.144 ZT20-23 14.163350000000001 14.163350000000001 14.163350000000001