condition mean min max ZT0-3 19.43725 14.9512 22.86815 ZT4-7 9.025045 9.025045 9.025045 ZT8-11 5.00987 5.00987 5.00987 ZT12-15 5.63161 4.674580000000001 6.58864 ZT16-19 5.983575 5.983575 5.983575 ZT20-23 13.26465 13.26465 13.26465