condition mean min max ZT0-3 155.947026725 140.3432085 171.55084495 ZT4-7 183.32630054999998 175.5600579 191.0925432 ZT8-11 262.07397727499995 236.06812474999998 288.07982979999997 ZT12-15 343.3799628 331.32247065 355.43745494999996 ZT16-19 319.442318725 272.9346251 365.95001235 ZT20-23 200.84579820000002 181.90590135000002 219.78569505000002