condition mean min max ZT0-3 86.460339 86.460339 86.460339 ZT4-7 131.20082 131.20082 131.20082 ZT8-11 112.3628445 112.3628445 112.3628445 ZT12-15 123.5291235 123.5291235 123.5291235 ZT16-19 21.6074065 21.6074065 21.6074065 ZT20-23 19.784748999999998 19.784748999999998 19.784748999999998